Penicillin G benzathine (By injection)
Penicillin G Benzathine (pen-i-SIL-in G BEN-za-theen)
Treats or prevents infections caused by bacteria. This medicine is an antibiotic.
When This Medicine Should Not Be Used
How to Use This Medicine
- Your doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given as a shot into one of your muscles.
- A nurse or other health provider will give you this medicine.
- Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.
- If you store this medicine at home, keep it in the refrigerator. Do not freeze.
Drugs and Foods to Avoid
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
- Some foods and medicines can affect how penicillin G benzathine works. Tell your doctor if you are using probenecid or tetracycline.
Warnings While Using This Medicine
- Tell your doctor if you are pregnant or breastfeeding, or if you have asthma or allergies, including a previous allergic reaction to a cephalosporin antibiotic.
- This medicine can cause diarrhea. Call your doctor if the diarrhea becomes severe, does not stop, or is bloody. Do not take any medicine to stop diarrhea until you have talked to your doctor. Diarrhea can occur 2 months or more after you stop taking this medicine.
- Call your doctor if your symptoms do not improve or if they get worse.
- Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.
- Keep all medicine out of the reach of children. Never share your medicine with anyone.
Possible Side Effects While Using This Medicine
Call your doctor right away if you notice any of these side effects:
- Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
- Diarrhea that may contain blood
If you notice these less serious side effects, talk with your doctor:
- Mild nausea
- Pain, itching, burning, swelling, or a lump under your skin where the shot was given
If you notice other side effects that you think are caused by this medicine, tell your doctor
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088
- Last reviewed on 10/4/2017
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