Penicillin belongs to the family of medications known as antibiotics. Penicillin is used to treat infections caused by certain bacteria. It is most commonly used to treat certain throat, respiratory tract, and skin infections. It may be used to prevent certain infections in people whose bodies areunable to fight infections. It works by killing or preventing the growth of bacteria that cause the infection.
Your doctor may have suggested this medication for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking this medication, speak to your doctor. Do not stop taking this medication without consulting your doctor.
Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take this medication if their doctor has not prescribed it.
Each orange, film-coated, round, biconvex tablet, scored and engraved "300" on one side and plain on the other side, contains 300 mg of penicillin V potassium (equivalent to 480,000 IU). Nonmedicinal ingredients: colloidal silicon dioxide, croscarmellose sodium, FD&C Yellow No. 10 Aluminum Lake, hydroxypropyl cellulose, magnesium stearate, methylcellulose, polyethylene glycol, purified water, sunset yellow aluminum lake, and titanium dioxide.
The recommended dose of penicillin for adults and children varies according to the infection being treated. The recommended dose for adults and children over 12 years old ranges from 1 to 4 grams daily, divided into 3 to 4 doses.
The dose for children under 12 years old is based on body weight. The recommended daily dose ranges from 25 mg to 100 mg per kg of body weight and is divided into 3 or 4 equal doses.
Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
When taken by mouth, penicillin should be taken on an empty stomach, either 1 hour before or 2 hours after meals.
Finish all this medication, even if you have started to feel better. This will reduce the chance of the infection returning.
It is important to take this medication exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Store this medication at room temperature and keep it out of the reach of children.
Do not take this medication if you:
Although most of the side effects listed below don’t happen very often, they could lead to serious problems if you do not seek medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
Stop taking the medication and seek immediate medical attention if any of the following occur:
Before you begin taking a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should take this medication.
Allergy: Some people who are allergic to cephalosporin antibiotics also experience allergic reactions to penicillin. Before you take penicillin, inform your doctor about any previous adverse reactions you have had to medications, especially cephalosporins and other penicillins. Contact your doctor at once if you experience signs of an allergic reaction, such as skin rash, itching, difficulty breathing or swelling of the face and throat.
Antibiotic-associated colitis: This medication, like other antibiotics, may cause a potentially dangerous condition called antibiotic-associated, or pseudomembranous, colitis. Symptoms include severe, watery diarrhea that may be bloody. If you notice these symptoms, stop taking penicillin and contact your doctor as soon as possible.
Bacterial resistance: Misuse of an antibiotic such as penicillin may lead to the growth of resistant bacteria that will not be killed by the antibiotic. If this happens, the antibiotic may not work for you in the future. Although you may begin to feel better when you first start taking penicillin, you need to take all of the medication exactly as prescribed by your doctor to finish ridding your body of the infection and to prevent resistant bacteria from taking hold. Do not take penicillin or other antibiotics to treat a viral infection such as the common cold; antibiotics do not kill viruses, and using them to treat viral infections can lead to the growth of resistant bacteria.
Birth control: Whether penicillin decreases the effectiveness of birth control pills is controversial. Some doctors recommend adding another method of birth control for the rest of the menstrual cycle when penicillin is taken.
Kidney function: Penicillin is removed from the body by the kidneys. People with impaired kidney function are at risk of increased side effects and may need lower doses of penicillin. People with kidney disease or reduced kidney function should discuss with their doctor how this medication may affect their medical condition, how their medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.
Overgrowth of organisms: Prolonged treatment with penicillin may allow normal fungus or types of bacteria not killed by the antibiotic to overgrow, causing unwanted infections such as yeast infections.
Pregnancy: Usual doses of penicillin appear to be safe during pregnancy.
Breast-feeding: This medication passes into breast milk. If you are a breast-
There may be an interaction between penicillin and any of the following:
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