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Penicillins  (Systemic)

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Brand Names

Some commonly used brand names are:

In the U.S.—

  • Amoxil1
  • Bactocill11
  • Beepen-VK13
  • Betapen-VK13
  • Bicillin L-A12
  • Cloxapen5
  • Crysticillin 300 A.S.12
  • Dynapen6
  • Dycill6
  • Geocillin4
  • Geopen4
  • Ledercillin VK13
  • Mezlin9
  • Nafcil10
  • Nallpen10
  • Omnipen2
  • Omnipen-N2
  • Pathocil6
  • Pentids12
  • Pen Vee K13
  • Permapen12
  • Pfizerpen12
  • Pfizerpen-AS12
  • Pipracil14
  • Polycillin2
  • Polycillin-N2
  • Polymox1
  • Principen2
  • Prostaphlin11
  • Spectrobid3
  • Staphcillin8
  • Tegopen5
  • Ticar17
  • Totacillin2
  • Totacillin-N2
  • Trimox1
  • Unipen10
  • V-Cillin K13
  • Veetids13
  • Wycillin12
  • Wymox1

In Canada—

  • Amoxil1
  • Ampicin2
  • Apo-Amoxi1
  • Apo-Ampi2
  • Apo-Cloxi5
  • Apo-Pen VK13
  • Ayercillin12
  • Bicillin L-A12
  • Fluclox7
  • Geopen Oral4
  • Ledercillin VK13
  • Megacillin12
  • Nadopen-V13
  • Nadopen-V 20013
  • Nadopen-V 40013
  • Novamoxin1
  • Novo-Ampicillin2
  • Novo-Cloxin5
  • Novo-Pen-VK13
  • Nu-Amoxi1
  • Nu-Ampi2
  • Nu-Cloxi5
  • Nu-Pen-VK13
  • Orbenin5
  • Penbritin2
  • Penglobe3
  • Pen-Vee13
  • Pipracil14
  • Pondocillin15
  • PVF13
  • PVF K13
  • Pyopen4
  • Selexid16
  • Tegopen5
  • Ticar17
  • Unipen10
  • V-Cillin K13
  • Wycillin12

Note:

For quick reference, the following penicillins are numbered to match the corresponding brand names.
This information applies to the following medicines:
1.  Amoxicillin (a-mox-i-SILL-in)
2.  Ampicillin (am-pi-SILL-in)
3.  Bacampicillin (ba-kam-pi-SILL-in)
4.  Carbenicillin (kar-ben-i-SILL-in)
5.  Cloxacillin (klox-a-SILL-in)
6.  Dicloxacillin (dye-klox-a-SILL-in)
7.  Flucloxacillin (floo-klox-a-SILL-in)*
8.  Methicillin (meth-i-SILL-in)
9.  Mezlocillin (mez-loe-SILL-in)
10.  Nafcillin (naf-SILL-in)
11.  Oxacillin (ox-a-SILL-in)
12.  Penicillin G (pen-i-SILL-in G)§
13.  Penicillin V (pen-i-SILL-in V)
14.  Piperacillin (pi-PER-a-sill-in)
15.  Pivampicillin (piv-am-pi-SILL-in)*
16.  Pivmecillinam (piv-me-SILL-in-am)*
17.  Ticarcillin (tye-kar-SILL-in)
‡  Generic name product may be available in the U.S.
§  Generic name product may be available in Canada
*  Not commercially available in the U.S.
†  Not commercially available in Canada

Category


Description

Penicillins are used to treat infections caused by bacteria. They work by killing the bacteria or preventing their growth.

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

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



Before Using This Medicine

In 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:

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:


Proper Use of This Medicine

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

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

For patients taking bacampicillin:

For patients taking penicillin G by mouth:

For patients taking the oral liquid form of penicillins :

For patients taking the chewable tablet form of amoxicillin :

To help clear up your infection completely, keep taking this medicine for the full time of treatment, even if you begin to feel better after a few days. If you have a “strep” infection, you should keep taking this medicine for at least 10 days. This is especially important in “strep” infections. Serious heart problems could 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 or urine. To help keep the amount constant, do not miss any doses. Also, it is best to take the doses at evenly spaced times, day and night. For example, if you are to take four doses a day, the doses should be spaced about 6 hours apart. If this interferes with your sleep or other daily activities, or if you need help in planning the best times to take your medicine, check with your health care professional.

Dosing—

The dose of these medicines will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of these medicines. If your dose is different, do not change it unless your doctor tells you to do so.

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

Missed dose—

If you miss a dose of this medicine, take it as soon as possible. This will help to keep a constant amount of medicine in the blood or urine. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Storage—

To store this medicine:


Precautions While Using This Medicine

If your symptoms do not improve within a few days, or if they become worse, check with your doctor.

Penicillins may cause diarrhea in some patients.

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

For diabetic patients:

Before you have any medical tests, tell the doctor in charge that you are taking 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 may need medical attention.

Stop taking this medicine and get emergency help immediately if any of the following side effects occur:

In addition to the side effects mentioned above, check with your doctor immediately if any of the following side effects occur:

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

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


Additional Information

Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although these uses are not included in product labeling, penicillins are used in certain patients with the following medical conditions:

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

Revised: 06/11/1999

Micromedex, Inc. Disclaimer

Copyright© 2003 Thomson MICROMEDEX. All rights reserved. USP DI® and Advice for the Patient® are registered trademarks of USP used under license to Micromedex, a business of Thomson Healthcare Inc. Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.