PENICILLINS (Systemic)

Some commonly used brand names are:

In the U.S.?

• Amoxil ¹
• Bactocill ¹¹
• Beepen-VK ¹³
• Betapen-VK ¹³
• Bicillin L-A ¹²
• Cloxapen ⁵
• Crysticillin 300 A.S. ¹²
• Dynapen ⁶
• Dycill ⁶
• Geocillin ⁴
• Geopen ⁴
• Ledercillin VK ¹³
• Mezlin ⁹
• Nafcil ¹⁰
• Nallpen ¹⁰
• Omnipen ²
• Omnipen-N ²
• Pathocil ⁶
• Pentids ¹²
• Pen Vee K ¹³
• Permapen ¹²
• Pfizerpen ¹²
• Pfizerpen-AS ¹²
• Pipracil ¹⁴
• Polycillin ²
• Polycillin-N ²
• Polymox ¹
• Principen ²
• Prostaphlin ¹¹
• Spectrobid ³
• Staphcillin ⁸
• Tegopen ⁵
• Ticar ¹⁷
• Totacillin ²
• Totacillin-N ²
• Trimox ¹
• Unipen ¹⁰
• V-Cillin K ¹³
• Veetids ¹³
• Wycillin ¹²
• Wymox ¹

In Canada?

• Amoxil ¹
• Ampicin ²
• Apo-Amoxi ¹
• Apo-Ampi ²
• Apo-Cloxi ⁵
• Apo-Pen VK ¹³
• Ayercillin ¹²
• Bicillin L-A ¹²
• Fluclox ⁷
• Geopen Oral ⁴
• Ledercillin VK ¹³
• Megacillin ¹²
• Nadopen-V ¹³
• Nadopen-V 200 ¹³
• Nadopen-V 400 ¹³
• Novamoxin ¹
• Novo-Ampicillin ²
• Novo-Cloxin ⁵
• Novo-Pen-VK ¹³
• Nu-Amoxi ¹
• Nu-Ampi ²
• Nu-Cloxi ⁵
• Nu-Pen-VK ¹³
• Orbenin ⁵
• Penbritin ²
• Penglobe ³
• Pen-Vee ¹³
• Pipracil ¹⁴
• Pondocillin ¹⁵
• PVF ¹³
• PVF K ¹³
• Pyopen ⁴
• Selexid ¹⁶
• Tegopen ⁵
• Ticar ¹⁷
• Unipen ¹⁰
• V-Cillin K ¹³
• Wycillin ¹²

Category

• Antibacterial, systemic?Amoxicillin; Ampicillin; Bacampicillin; Carbenicillin; Cloxacillin; Dicloxacillin; Flucloxacillin; Methicillin; Mezlocillin; Nafcillin; Oxacillin; Penicillin G; Penicillin V; Piperacillin; Pivampicillin; Pivmecillinam; Ticarcillin

Description

Penicillins are used totreat infections caused by bacteria. They work by killing the bacteria orpreventing their growth.

There are several different kinds of penicillins. Each is used to treatdifferent kinds of infections. One kind of penicillin usually may not be usedin place of another. In addition, penicillins are used to treat bacterialinfections in many different parts of the body. They are sometimes given withother antibacterial medicines (antibiotics). Some of the penicillins may alsobe used for other problems as determined by your doctor. However, none ofthe penicillins will work for colds, flu, or other virus infections.

Penicillins are available only with your doctor's prescription, in thefollowing dosage forms:

Oral
• Amoxicillin
  • Capsules (U.S. and Canada)
  • Oral suspension (U.S. and Canada)
  • Tablets (U.S.)
  • Chewable tablets (U.S. and Canada)
• Ampicillin
  • Capsules (U.S. and Canada)
  • Oral suspension (U.S. and Canada)
• Bacampicillin
  • Oral suspension (U.S.)
  • Tablets (U.S. and Canada)
• Carbenicillin
  • Tablets (U.S. and Canada)
• Cloxacillin
  • Capsules (U.S. and Canada)
  • Oral solution (U.S. and Canada)
• Dicloxacillin
  • Capsules (U.S.)
  • Oral suspension (U.S.)
• Flucloxacillin
  • Capsules (Canada)
  • Oral suspension (Canada)
• Nafcillin
  • Capsules (U.S.)
  • Tablets (U.S.)
• Oxacillin
  • Capsules (U.S.)
  • Oral solution (U.S.)
• Penicillin G Benzathine
  • Oral suspension (Canada)
• Penicillin G Potassium
  • Oral solution (U.S.)
  • Tablets (U.S. and Canada)
• Penicillin V Benzathine
  • Oral suspension (Canada)
• Penicillin V Potassium
  • Oral solution (U.S. and Canada)
  • Tablets (U.S. and Canada)
• Pivampicillin
  • Oral suspension (Canada)
  • Tablets (Canada)
• Pivmecillinam
  • Tablets (Canada)

Parenteral
• Ampicillin
  • Injection (U.S. and Canada)
• Carbenicillin
  • Injection (U.S. and Canada)
• Cloxacillin
  • Injection (Canada)
• Methicillin
  • Injection (U.S.)
• Mezlocillin
  • Injection (U.S.)
• Nafcillin
  • Injection (U.S. and Canada)
• Oxacillin
  • Injection (U.S.)
• Penicillin G Benzathine
  • Injection (U.S. and Canada)
• Penicillin G Potassium
  • Injection (U.S. and Canada)
• Penicillin G Procaine
  • Injection (U.S. and Canada)
• Penicillin G Sodium
  • Injection (U.S. and Canada)
• Piperacillin
  • Injection (U.S. and Canada)
• Ticarcillin
  • Injection (U.S. and Canada)

Before Using This Medicine

In deciding to use a medicine,the risks of taking the medicine must be weighed against the good it willdo. This is a decision you and your doctor will make. For penicillins, thefollowing should be considered:

Allergies?Tell your doctor if you have ever had any unusual orallergic reaction to any of the penicillins or cephalosporins. Also tell yourhealth care professional if you are allergic to any other substances, suchas foods, preservatives, or dyes, or procaine (e.g., Novocain) or other ester-typeanesthetics (medicines that cause numbing) if you are receiving penicillinG procaine.

Diet?Make certain your health care professionalknows if you are on a low-sodium (low-salt) diet. Some of these medicinescontain enough sodium to cause problems in some people.

Pregnancy?Penicillins have not been studied in pregnant women.However, penicillins have been widely used in pregnant women and have notbeen shown to cause birth defects or other problems in animal studies.

Breast-feeding?Penicillins pass into the breast milk. Even thoughonly small amounts may pass into breast milk, allergic reactions, diarrhea,fungus infections, and skin rash may occur in nursing babies.

Children?Many penicillins have been used in children and,in effective doses, are not expected to cause different side effects or problemsin children than they do in adults.

Some strengths of the chewable tablets of amoxicillin contain aspartame,which is changed by the body to phenylalanine, a substance that is harmfulto patients with phenylketonuria.

Older adults?Penicillins have been used in the elderly and havenot been shown to cause different side effects or problems in older peoplethan they do in younger adults.

Other medicines?Although certain medicines should not be usedtogether at all, in other cases two different medicines may be used togethereven if an interaction might occur. In these cases, your doctor may want tochange the dose, or other precautions may be necessary. When you are takinga penicillin, it is especially important that your health care professionalknow if you are taking any of the following:

• Acetaminophen (e.g., Tylenol) (with long-term, high-dose use) or
• Amiodarone (e.g., Cordarone) or
• Anabolic steroids (nandrolone [e.g., Anabolin], oxandrolone [e.g.,Anavar], oxymetholone [e.g., Anadrol], stanozolol [e.g., Winstrol]) or
• Androgens (male hormones) or
• Antithyroid agents (medicine for overactive thyroid) or
• Carmustine (e.g., BiCNU) or
• Chloroquine (e.g., Aralen) or
• Dantrolene (e.g., Dantrium) or
• Daunorubicin (e.g., Cerubidine) or
• Disulfiram (e.g., Antabuse) or
• Divalproex (e.g., Depakote) or
• Estrogens (female hormones) or
• Etretinate (e.g., Tegison) or
• Gold salts (medicine for arthritis) or
• Hydroxychloroquine (e.g., Plaquenil) or
• Mercaptopurine (e.g., Purinethol) or
• Methotrexate (e.g., Mexate) or
• Methyldopa (e.g., Aldomet) or
• Naltrexone (e.g., Trexan) (with long-term, high-dose use) or
• Oral contraceptives (birth control pills) containing estrogen or
• Other anti-infectives by mouth or by injection (medicine for infection)or
• Phenothiazines (acetophenazine [e.g., Tindal], chlorpromazine [e.g.,Thorazine], fluphenazine [e.g., Prolixin], mesoridazine [e.g., Serentil],perphenazine [e.g., Trilafon], prochlorperazine [e.g., Compazine], promazine[e.g., Sparine], promethazine [e.g., Phenergan], thioridazine [e.g., Mellaril],trifluoperazine [e.g., Stelazine], triflupromazine [e.g., Vesprin], trimeprazine[e.g., Temaril]) or
• Plicamycin (e.g., Mithracin) or
• Valproic acid (e.g., Depakene)?These medicines may increasethe chance of liver damage if taken with cloxacillin, dicloxacillin, flucloxacillin,mezlocillin, nafcillin, oxacillin, or piperacillin

• Amiloride (e.g., Midamor) or
• Benazepril (e.g., Lotensin) or
• Captopril (e.g., Capoten) or
• Enalapril (e.g., Vasotec) or
• Fosinopril (e.g., Monopril) or
• Lisinopril (e.g., Prinivil, Zestril) or
• Potassium-containing medicine or
• Quinapril (e.g., Accupril) or
• Ramipril (e.g., Altace) or
• Spironolactone (e.g., Aldactone) or
• Triamterene (e.g., Dyrenium)?Use of these medicines with penicillinG by injection may cause an increase in side effects

• Anticoagulants (blood thinners) or
• Dipyridamole (e.g., Persantine) or
• Divalproex (e.g., Depakote) or
• Heparin (e.g., Panheprin) or
• Inflammation or pain medicine (except narcotics) or
• Pentoxifylline (e.g., Trental) or
• Plicamycin (e.g., Mithracin) or
• Sulfinpyrazone (e.g., Anturane) or
• Valproic acid (e.g., Depakene)?Use of these medicines withhigh doses of carbenicillin, piperacillin, or ticarcillin may increase thechance of bleeding

• Chloramphenicol (e.g., Chloromycetin) or
• Erythromycins (e.g., E.E.S., E-Mycin, ERYC) or
• Sulfonamides (e.g., Gantanol, Gantrisin) or
• Tetracyclines (e.g., Achromycin, Minocin, Vibramycin)?Use ofthese medicines with penicillins may prevent the penicillin from working properly

• Cholestyramine (e.g., Questran) or
• Colestipol (e.g., Colestid)?Use of these medicines with oralpenicillin G may prevent penicillin G from working properly

• Oral contraceptives (birth control pills) containing estrogen?Useof ampicillin, amoxicillin, or penicillin V with estrogen-containing oralcontraceptives may prevent oral contraceptives from working properly, increasingthe chance of pregnancy

• Methotrexate (e.g., Mexate)?Use of methotrexate with penicillinsmay increase the chance of side effects of methotrexate

• Probenecid (e.g., Benemid)?Probenecid causes penicillins tobuild up in the blood. This may increase the chance of side effects. However,your doctor may want to give you probenecid with a penicillin to treat someinfections

Other medical problems?The presence of other medicalproblems may affect the use of penicillins. Make sure you tell your doctorif you have any other medical problems, especially:

• Allergy, general (such as asthma, eczema, hay fever, hives), historyof?Patients with a history of general allergies may be more likely tohave a severe reaction to penicillins

• Bleeding problems, history of?Patients with a history of bleedingproblems may be more likely to have bleeding when receiving carbenicillin,piperacillin, or ticarcillin

• Congestive heart failure (CHF) or
• High blood pressure?Large doses of carbenicillin or ticarcillinmay make these conditions worse, because these medicines contain a large amountof salt

• Cystic fibrosis?Patients with cystic fibrosis may have an increasedchance of fever and skin rash when receiving piperacillin

• Kidney disease?Patients with kidney disease may have an increasedchance of side effects

• Mononucleosis (?mono?)?Patients withmononucleosis may have an increased chance of skin rash when receiving ampicillin,bacampicillin, or pivampicillin

• Phenylketonuria?Some strengths of the amoxicillin chewabletablets contain aspartame, which is changed by the body to phenylalanine,a substance that is harmful to patients with phenylketonuria.

• Stomach or intestinal disease, history of (especially colitis, includingcolitis caused by antibiotics)?Patients with a history of stomach orintestinal disease may be more likely to develop colitis while taking penicillins

Proper Use of This Medicine

Penicillins(except bacampicillin tablets, amoxicillin, penicillin V, pivampicillin, andpivmecillinam) are best taken with a full glass (8 ounces) of water on anempty stomach (either 1 hour before or 2 hours after meals) unless otherwisedirected by your doctor.

For patients taking amoxicillin, penicillin V, pivampicillin,and pivmecillinam:

• Amoxicillin, penicillin V, pivampicillin, and pivmecillinam may betaken on a full or empty stomach.
• The liquid form of amoxicillin may alsobe taken by itself or mixed with formulas, milk, fruit juice, water, gingerale, or other cold drinks. If mixed with other liquids, take immediately aftermixing. Be sure to drink all the liquid to get the full dose of medicine.

For patients taking bacampicillin:

• The liquid form of this medicine is best taken with a full glass(8 ounces) of water on an empty stomach (either 1 hour before or 2 hours aftermeals) unless otherwise directed by your doctor.
• The tablet form of this medicine may be taken on a full or emptystomach.

For patients taking penicillin G by mouth:

• Do not drink acidic fruit juices (for example, orange or grapefruitjuice) or other acidic beverages within 1 hour of taking penicillin G sincethis may keep the medicine from working properly.

For patients taking the oral liquid form of penicillins:

• This medicine is to be taken by mouth even if it comes in a dropperbottle. If this medicine does not come in a dropper bottle, use a speciallymarked measuring spoon or other device to measure each dose accurately. Theaverage household teaspoon may not hold the right amount of liquid.
• Do not use after the expiration date on the label. The medicine maynot work properly after that date. If you have any questions about this, checkwith your pharmacist.

For patients taking the chewable tablet form of amoxicillin:

• Tablets should be chewed or crushed before they are swallowed.

To help clear up your infection completely, keep takingthis medicine for the full time of treatment, even if you begin tofeel better after a few days. If you have a ?strep?infection, you should keep taking this medicine for at least 10 days. Thisis especially important in ?strep? infections. Serious heart problemscould develop later if your infection is not cleared up completely.Also, if you stop taking this medicine too soon, your symptoms may return.

This medicine works best when there is a constant amount in the blood orurine. To help keep the amount constant, do not missany doses. Also, it is best to take the doses at evenly spaced times, dayand night. For example, if you are to take four doses a day, the dosesshould be spaced about 6 hours apart. If this interferes with your sleep orother daily activities, or if you need help in planning the best times totake your medicine, check with your health care professional.

Dosing?The dose of these medicines will be differentfor different patients. Follow your doctor's orders orthe directions on the label. The following information includes onlythe average doses of these medicines. If your dose isdifferent, do not change it unless your doctor tells you to do so.

The number of tablets or teaspoonfuls of suspension that you take dependson the strength of the medicine. Also, the number ofdoses you take each day, the time allowed between doses, and the length oftime you take the medicine depend on the medical problem for which you aretaking a penicillin.

For amoxicillin
• For bacterial infections:
  • For oral dosage forms (capsules, oralsuspension, tablets, and chewable tablets):
    • Adults, teenagers, and children weighing more than 40 kilograms (kg)(88 pounds)?250 to 500 milligrams (mg) every eight hours or 500 to 875mg every twelve hours, depending on the type and severity of the infection.
    • Neonates and infants up to 3 months of age?Dose is based onbody weight and must be determined by your doctor. The usual dose is 15 mgper kg (6.8 mg per pound) of body weight or less every twelve hours.
    • Infants 3 months of age and older and children weighing up to 40kg (88 lbs.)?Dose is based on body weight and must be determined byyour doctor. The usual dose is 6.7 to 13.3 mg per kg (3 to 6 mg per pound)of body weight every eight hours or 12.5 to 22.5 mg per kg (5.7 to 10.2 mgper pound) of body weight every twelve hours.
• For duodenal ulcers (associated with Helicobacter pylori bacterial infection):
  • For oral dosage forms (capsules, oralsuspension, tablets, and chewable tablets):
    • For triple medicine therapy?
      • Adults: 1000 mg twice a day every twelve hours for fourteen days,along with the two other medicines, clarithromycin and lansoprazole, as directedby your doctor.
      • Teenagers and children: Use and dose must be determined by your doctor.
    • For dual medicine therapy?
      • Adults: 1000 mg three times a day every eight hours for fourteendays, along with the other medicine, lansoprazole, as directed by your doctor.
      • Teenagers and children: Use and dose must be determined by your doctor.

For ampicillin
• For bacterial infections:
  • For oral dosage forms (capsules and oralsuspension):
    • Adults, teenagers, and children weighing more than 20 kilograms (kg)(44 pounds)?250 to 500 milligrams (mg) every six hours.
    • Infants and children weighing up to 20 kg (44 pounds)?Doseis based on body weight and must be determined by your doctor. The usual doseis 12.5 to 25 mg per kg (5.7 to 11.4 mg per pound) of body weight every sixhours; or 16.7 to 33.3 mg per kg (7.6 to 15 mg per pound) of body weight everyeight hours.
  • For injection dosage form:
    • Adults, teenagers, and children weighing more than 20 kg (44 pounds)?250to 500 mg, injected into a vein or muscle every three to six hours.
    • Infants and children weighing up to 20 kg (44 pounds)?Doseis based on body weight and must be determined by your doctor. The usual doseis 12.5 mg per kg (5.7 mg per pound) of body weight, injected into a veinor muscle every six hours.

For bacampicillin
• For bacterial infections:
  • For oral dosage forms (oral suspensionand tablets):
    • Adults, teenagers, and children weighing more than 25 kilograms (kg)(55 pounds)?400 to 800 milligrams (mg) every twelve hours.
    • Children weighing up to 25 kg (55 pounds)?Bacampicillin tabletsare not recommended for use in children weighing up to 25 kg (55 pounds).The dose of the oral suspension is based on body weight and must be determinedby your doctor. The usual dose is 12.5 to 25 mg per kg (5.7 to 11.4 mg perpound) of body weight every twelve hours.

For carbenicillin
• For bacterial infections:
  • For oral dosage form (tablets):
    • Adults and teenagers?500 milligrams (mg) to 1 gram every sixhours.
    • Children?Dose must be determined by your doctor.
  • For injection dosage form:
    • Adults and teenagers?Dose is based on body weight and mustbe determined by your doctor. The usual dose is 50 to 83.3 mg per kilogram(kg) (22.8 to 37.9 mg per pound) of body weight, injected into a vein or muscleevery four hours.
    • Older infants and children?Dose is based on body weight andmust be determined by your doctor. The usual dose is 16.7 to 75 mg per kg(7.6 to 34 mg per pound) of body weight, injected into a vein or muscle everyfour to six hours.

For cloxacillin
• For bacterial infections:
  • For oral dosage form (capsules and oralsolution):
    • Adults, teenagers, and children weighing more than 20 kilograms (kg)(44 pounds)?250 to 500 milligrams (mg) every six hours.
    • Infants and children weighing up to 20 kg (44 pounds)?Doseis based on body weight and must be determined by your doctor. The usual doseis 6.25 to 12.5 mg per kg (2.8 to 5.7 mg per pound) of body weight every sixhours.
  • For injection dosage form:
    • Adults, teenagers, and children weighing more than 20 kg?250to 500 mg, injected into a vein every six hours.
    • Infants and children weighing up to 20 kg (44 pounds)?Doseis based on body weight and must be determined by your doctor. The usual doseis 6.25 to 12.5 mg per kg (2.8 to 5.7 mg per pound) of body weight, injectedinto a vein every six hours.

For dicloxacillin
• For bacterial infections:
  • For oral dosage form (capsules and oralsuspension):
    • Adults, teenagers, and children weighing more than 40 kilograms (kg)(88 pounds)?125 to 250 milligrams (mg) every six hours.
    • Infants and children weighing up to 40 kg (88 pounds)?Doseis based on body weight and must be determined by your doctor. The usual doseis 3.1 to 6.2 mg per kg (1.4 to 2.8 mg per pound) of body weight every sixhours.

For flucloxacillin
• For bacterial infections:
  • For oral dosage form (capsules and oralsuspension):
    • Adults, teenagers, and children more than 12 years of age and weighingmore than 40 kilograms (kg) (88 pounds)?250 to 500 milligrams (mg) everysix hours.
    • Children less than 12 years of age and weighing up to 40 kg (88 pounds)?125to 250 mg every six hours; or 6.25 to 12.5 mg per kg (2.8 to 5.7 mg per pound)of body weight every six hours.
    • Infants up to 6 months of age?Dose is based on body weightand must be determined by your doctor. The usual dose is 6.25 mg per kg (2.8mg per pound) of body weight every six hours.

For methicillin
• For bacterial infections:
  • For injection dosage form:
    • Adults, teenagers, and children weighing more than 40 kilograms (kg)(88 pounds)?1 gram injected into a muscle every four to six hours; or1 gram injected into a vein every six hours.
    • Children weighing up to 40 kg (88 pounds)?Dose is based onbody weight and must be determined by your doctor. The usual dose is 25 milligrams(mg) per kg (11.4 mg per pound) of body weight, injected into a vein or muscleevery six hours.

For mezlocillin
• For bacterial infections:
  • For injection dosage form:
    • Adults and teenagers?Dose is based on body weight and mustbe determined by your doctor. The usual dose is 33.3 to 87.5 milligrams (mg)per kilogram (kg) (15.1 to 39.8 mg per pound) of body weight, injected intoa vein or muscle every four to six hours; or 3 to 4 grams every four to sixhours.
    • Infants over 1 month of age and children up to 12 years of age?Doseis based on body weight and must be determined by your doctor. The usual doseis 50 mg per kg (22.7 mg per pound) of body weight, injected into a vein ormuscle every four hours.

For nafcillin
• For bacterial infections:
  • For oral dosage form (capsules and tablets):
    • Adults and teenagers?250 milligrams (mg) to 1 gram every fourto six hours.
    • Older infants and children?Dose is based on body weight andmust be determined by your doctor. The usual dose is 6.25 to 12.5 mg per kilogram(kg) (2.8 to 5.7 mg per pound) of body weight every six hours.
    • Newborns?Dose is based on body weight and must be determinedby your doctor. The usual dose is 10 mg per kg (4.5 mg per pound) of bodyweight every six to eight hours.
  • For injection dosage form:
    • Adults and teenagers?500 mg to 2 grams injected into a veinor muscle every four to six hours.
    • Infants and children?Dose is based on body weight and mustbe determined by your doctor. The usual dose is 10 to 25 mg per kg (4.5 to11.4 mg per pound) of body weight, injected into a muscle every twelve hours;or 10 to 40 mg per kg (4.5 to 18.2 mg per pound) of body weight, injectedinto a vein every four to eight hours.

For oxacillin
• For bacterial infections:
  • For oral dosage form (capsules and oralsolution):
    • Adults, teenagers, and children weighing more than 40 kilograms (kg)(88 pounds)?500 milligrams (mg) to 1 gram every four to six hours.
    • Children weighing up to 40 kg (88 pounds)?Dose is based onbody weight and must be determined by your doctor. The usual dose is 12.5to 25 mg per kg (5.7 to 11.4 mg per pound) of body weight every six hours.
  • For injection dosage form:
    • Adults, teenagers, and children weighing more than 40 kg (88 pounds)?250mg to 1 gram injected into a vein or muscle every four to six hours.
    • Children weighing up to 40 kg (88 pounds)?Dose is based onbody weight and must be determined by your doctor. The usual dose is 12.5to 25 mg per kg (5.7 to 11.4 mg per pound) of body weight, injected into avein or muscle every four to six hours.
    • Premature infants and newborns?Dose is based on body weightand must be determined by your doctor. The usual dose is 6.25 mg per kg (2.8mg per pound) of body weight, injected into a vein or muscle every six hours.

For penicillin G
• For bacterial infections:
  • For oral dosage form (oral solution,oral suspension, and tablets):
    • Adults and teenagers?200,000 to 500,000 Units (125 to 312 milligrams[mg]) every four to six hours.
    • Infants and children less than 12 years of age?Dose is basedon body weight and must be determined by your doctor. The usual dose is 4167to 30,000 Units per kilogram (kg) (189 to 13,636 Units per pound) of bodyweight every four to eight hours.
  • For benzathine injection dosage form:
    • Adults and teenagers?1,200,000 to 2,400,000 Units injectedinto a muscle as a single dose.
    • Infants and children?300,000 to 1,200,000 Units injected intoa muscle as a single dose; or 50,000 Units per kg (22,727 Units per pound)of body weight injected into a muscle as a single dose.
  • For injection dosage forms (potassiumand sodium salts):
    • Adults and teenagers?1,000,000 to 5,000,000 Units, injectedinto a vein or muscle every four to six hours.
    • Older infants and children?Dose is based on body weight andmust be determined by your doctor. The usual dose is 8333 to 25,000 Unitsper kg (3788 to 11,363 Units per pound) of body weight, injected into a veinor muscle every four to six hours.
    • Premature infants and newborns?Dose is based on body weightand must be determined by your doctor. The usual dose is 30,000 Units perkg (13,636 Units per pound) of body weight, injected into a vein or muscleevery twelve hours.
  • For procaine injection dosage form:
    • Adults and teenagers?600,000 to 1,200,000 Units injected intoa muscle once a day.
    • Children?Dose is based on body weight and must be determinedby your doctor. The usual dose is 50,000 Units per kg (22,727 Units per pound)of body weight, injected into a muscle once a day.

For penicillin V
• For bacterial infections:
  • For the benzathine salt oral dosage form(oral solution):
    • Adults and teenagers?200,000 to 500,000 Units every six toeight hours.
    • Children?100,000 to 250,000 Units every six to eight hours.
  • For the potassium salt oral dosage forms(oral solution, oral suspension, and tablets):
    • Adults and teenagers?125 to 500 milligrams (mg) every six toeight hours.
    • Children?Dose is based on body weight and must be determinedby your doctor. The usual dose is 2.5 to 16.7 mg per kilogram (kg) (1.1 to7.6 mg per pound) of body weight every four to eight hours.

For piperacillin
• For bacterial infections:
  • For injection dosage form:
    • Adults and teenagers?3 to 4 grams, injected into a vein ormuscle every four to six hours.
    • Infants and children?Dose must be determined by your doctor.

For pivampicillin
• For bacterial infections:
  • For oral dosage form (oral suspension):
    • Adults, teenagers, and children 10 years of age and older?525to 1050 milligrams (mg) two times a day.
    • Children 7 to 10 years of age?350 mg two times a day.
    • Children 4 to 6 years of age?262.5 mg two times a day.
    • Children 1 to 3 years of age?175 mg two times a day.
    • Infants 3 to 12 months of age?Dose is based on body weightand must be determined by your doctor. The usual dose is 20 to 30 mg per kilogram(kg) (9.1 to 13.6 mg per pound) of body weight two times a day.
  • For oral dosage form (tablets):
    • Adults, teenagers, and children 10 years of age and older?500mg to 1 gram two times a day.
    • Children up to 10 years of age?Dose must be determined by yourdoctor.

For pivmecillinam
• For bacterial infections:
  • For oral dosage form (tablets):
    • Adults, teenagers, and children weighing more than 40 kilograms (kg)(88 pounds)?200 milligrams (mg) two to four times a day for three days.
    • Children up to 40 kg (88 pounds)?Dose must be determined byyour doctor.

For ticarcillin
• For bacterial infections:
  • For injection dosage form:
    • Adults, teenagers, and children weighing more than 40 kilograms (kg)(88 pounds)?3 grams injected into a vein every four hours; or 4 gramsinjected into a vein every six hours.
    • Children up to 40 kg (88 pounds)?Dose is based on body weightand must be determined by your doctor. The usual dose is 33.3 to 75 milligrams(mg) per kg (15 to 34 mg per pound) of body weight, injected into a vein everyfour to six hours.

Missed dose?If you miss a dose of this medicine, take it assoon as possible. This will help to keep a constant amount of medicine inthe blood or urine. However, if it is almost time for your next dose, skipthe missed dose and go back to your regular dosing schedule. Do not doubledoses.

Storage?To store this medicine:

• Keep out of the reach of children.
• Store away from heat and direct light.
• Do not store the capsule or tablet form of penicillins in the bathroom,near the kitchen sink, or in other damp places. Heat or moisture may causethe medicine to break down.
• Store the oral liquid form of penicillins in the refrigerator becauseheat will cause this medicine to break down. However, keep the medicine fromfreezing. Follow the directions on the label.
• Do not keep outdated medicine or medicine no longer needed. Be surethat any discarded medicine is out of the reach of children.

Precautions While Using This Medicine

If yoursymptoms do not improve within a few days, or if they become worse, checkwith your doctor.

Penicillins may cause diarrhea in some patients.

• Check with your doctor if severe diarrhea occurs. Severe diarrhea may be a sign of a serious side effect. Do not take any diarrhea medicine without first checking with your doctor. Diarrhea medicines may make your diarrhea worse or make it last longer.
• For mild diarrhea, diarrhea medicine containing kaolin or attapulgite(e.g., Kaopectate tablets, Diasorb) may be taken. However, other kinds ofdiarrhea medicine should not be taken. They may make your diarrhea worse ormake it last longer.
• If you have any questions about this or if mild diarrhea continuesor gets worse, check with your health care professional.

Oral contraceptives (birth control pills) containingestrogen may not work properly if you take them while you are taking ampicillin,amoxicillin, or penicillin V. Unplanned pregnancies may occur. You shoulduse a different or additional means of birth control while you are takingany of these penicillins. If you have any questions about this, checkwith your health care professional.

For diabetic patients:

• Penicillins may cause false test results withsome urine sugar tests. Check with your doctor before changing yourdiet or the dosage of your diabetes medicine.

Before you have any medical tests, tell the doctor in charge that you aretaking this medicine. The results of some tests may be affected by this medicine.

Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects.Although not all of these side effects may occur, if they do occur they mayneed medical attention.

Stop taking this medicineand get emergency help immediately if any of the following side effectsoccur:

Less common

Fast or irregular breathing; fever; joint pain; lightheadedness or fainting(sudden); puffiness or swelling around the face; red, scaly skin; shortness of breath; skin rash, hives, itching

In addition to the side effectsmentioned above, check with your doctor immediatelyif any of the following side effects occur:

Rare

Abdominal or stomach cramps and pain (severe); abdominal tenderness; convulsions (seizures); decreased amount of urine; diarrhea(watery and severe), which may also be bloody; mentaldepression; nausea and vomiting; pain at place of injection; sore throat and fever; unusual bleeding or bruising; yellow eyes or skin

Note:

Some of the above side effects (severe abdominal or stomach crampsand pain, and watery and severe diarrhea, which may also be bloody) may alsooccur up to several weeks after you stop taking any of these medicines.

Rare?For penicillin G procaine only

Agitation or combativeness; anxiety; confusion; fear of impendingdeath; feeling, hearing, or seeing things that arenot real

Other side effects may occur that usually donot need medical attention. These side effects may go away during treatmentas your body adjusts to the medicine. However, check with your doctor if anyof the following side effects continue or are bothersome:

More common

Diarrhea (mild); headache; sore mouth or tongue; vaginal itchingand discharge; white patches in the mouth and/oron the tongue

Other sideeffects not listed above may also occur in some patients. If you notice anyother effects, check with your doctor.

Additional Information

Once a medicine has been approvedfor marketing for a certain use, experience may show that it is also usefulfor other medical problems. Although these uses are not included in productlabeling, penicillins are used in certain patients with the following medicalconditions:

• Chlamydia infections in pregnant women?Amoxicillin and ampicillin
• Gas gangrene?Penicillin G
• Helicobacter pylori-associated gastritis orpeptic ulcer disease?Amoxicillin
• Leptospirosis?Ampicillin and penicillin G
• Lyme disease?Amoxicillin and penicillin V
• Typhoid fever?Amoxicillin and ampicillin

Other than the above information, there is no additional information relatingto proper use, precautions, or side effects for these uses.