Penicillins (Systemic)
Before Using This MedicineIn deciding to use a medicine,
the risks of taking the medicine must be weighed against the good it will
do. This is a decision you and your doctor will make. For penicillins, the
following should be considered:
Allergies - Tell your doctor if you have ever had any unusual or
allergic reaction to any of the penicillins or cephalosporins. Also tell your
health care professional if you are allergic to any other substances, such
as foods, preservatives, or dyes, or procaine (e.g., Novocain) or other ester-type
anesthetics (medicines that cause numbing) if you are receiving penicillin
G procaine.
Diet - Make certain your health care professional
knows if you are on a low-sodium (low-salt) diet. Some of these medicines
contain 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 not
been shown to cause birth defects or other problems in animal studies.
Breast-feeding - Penicillins pass into the breast milk. Even though
only 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 problems
in 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 harmful
to patients with phenylketonuria.
Older adults - Penicillins have been used in the elderly and have
not been shown to cause different side effects or problems in older people
than they do in younger adults.
Other medicines - Although certain medicines should not be used
together at all, in other cases two different medicines may be used together
even if an interaction might occur. In these cases, your doctor may want to
change the dose, or other precautions may be necessary. When you are taking
a penicillin, it is especially important that your health care professional
know if you are taking any of the following:
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Acetaminophen (e.g., Tylenol) (with long-term, high-dose use) or
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Amiodarone (e.g., Cordarone) or
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Anabolic steroids (nandrolone [e.g., Anabolin], oxandrolone [e.g.,
Anavar], oxymetholone [e.g., Anadrol], stanozolol [e.g., Winstrol]) or
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Androgens (male hormones) or
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Antithyroid agents (medicine for overactive thyroid) or
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Carmustine (e.g., BiCNU) or
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Chloroquine (e.g., Aralen) or
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Dantrolene (e.g., Dantrium) or
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Daunorubicin (e.g., Cerubidine) or
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Disulfiram (e.g., Antabuse) or
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Divalproex (e.g., Depakote) or
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Estrogens (female hormones) or
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Etretinate (e.g., Tegison) or
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Gold salts (medicine for arthritis) or
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Hydroxychloroquine (e.g., Plaquenil) or
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Mercaptopurine (e.g., Purinethol) or
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Methotrexate (e.g., Mexate) or
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Methyldopa (e.g., Aldomet) or
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Naltrexone (e.g., Trexan) (with long-term, high-dose use) or
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Oral contraceptives (birth control pills) containing estrogen or
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Other anti-infectives by mouth or by injection (medicine for infection)
or
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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
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Plicamycin (e.g., Mithracin) or
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Valproic acid (e.g., Depakene) - These medicines may increase
the chance of liver damage if taken with cloxacillin, dicloxacillin, flucloxacillin,
mezlocillin, nafcillin, oxacillin, or piperacillin
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Amiloride (e.g., Midamor) or
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Benazepril (e.g., Lotensin) or
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Captopril (e.g., Capoten) or
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Enalapril (e.g., Vasotec) or
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Fosinopril (e.g., Monopril) or
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Lisinopril (e.g., Prinivil, Zestril) or
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Potassium-containing medicine or
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Quinapril (e.g., Accupril) or
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Ramipril (e.g., Altace) or
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Spironolactone (e.g., Aldactone) or
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Triamterene (e.g., Dyrenium) - Use of these medicines with penicillin
G by injection may cause an increase in side effects
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Anticoagulants (blood thinners) or
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Dipyridamole (e.g., Persantine) or
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Divalproex (e.g., Depakote) or
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Heparin (e.g., Panheprin) or
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Inflammation or pain medicine (except narcotics) or
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Pentoxifylline (e.g., Trental) or
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Plicamycin (e.g., Mithracin) or
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Sulfinpyrazone (e.g., Anturane) or
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Valproic acid (e.g., Depakene) - Use of these medicines with
high doses of carbenicillin, piperacillin, or ticarcillin may increase the
chance of bleeding
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Chloramphenicol (e.g., Chloromycetin) or
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Erythromycins (e.g., E.E.S., E-Mycin, ERYC) or
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Sulfonamides (e.g., Gantanol, Gantrisin) or
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Tetracyclines (e.g., Achromycin, Minocin, Vibramycin) - Use of
these medicines with penicillins may prevent the penicillin from working properly
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Cholestyramine (e.g., Questran) or
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Colestipol (e.g., Colestid) - Use of these medicines with oral
penicillin G may prevent penicillin G from working properly
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Oral contraceptives (birth control pills) containing estrogen - Use
of ampicillin, amoxicillin, or penicillin V with estrogen-containing oral
contraceptives may prevent oral contraceptives from working properly, increasing
the chance of pregnancy
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Methotrexate (e.g., Mexate) - Use of methotrexate with penicillins
may increase the chance of side effects of methotrexate
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Probenecid (e.g., Benemid) - Probenecid causes penicillins to
build 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 some
infections
Other medical problems - The presence of other medical
problems may affect the use of penicillins. Make sure you tell your doctor
if you have any other medical problems, especially:
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Allergy, general (such as asthma, eczema, hay fever, hives), history
of - Patients with a history of general allergies may be more likely to
have a severe reaction to penicillins
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Bleeding problems, history of - Patients with a history of bleeding
problems may be more likely to have bleeding when receiving carbenicillin,
piperacillin, or ticarcillin
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Congestive heart failure (CHF) or
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High blood pressure - Large doses of carbenicillin or ticarcillin
may make these conditions worse, because these medicines contain a large amount
of salt
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Cystic fibrosis - Patients with cystic fibrosis may have an increased
chance of fever and skin rash when receiving piperacillin
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Kidney disease - Patients with kidney disease may have an increased
chance of side effects
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Mononucleosis (�mono�) - Patients with
mononucleosis may have an increased chance of skin rash when receiving ampicillin,
bacampicillin, or pivampicillin
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Phenylketonuria - Some strengths of the amoxicillin chewable
tablets contain aspartame, which is changed by the body to phenylalanine,
a substance that is harmful to patients with phenylketonuria.
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Stomach or intestinal disease, history of (especially colitis, including
colitis caused by antibiotics) - Patients with a history of stomach or
intestinal disease may be more likely to develop colitis while taking penicillins
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