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Penicillin is the name for a group of custom pharmacy antibiotic drugs each with particular variants, applications, and uses. Penicillin antibiotics have a long history of usage in medicine and are still widely used today. Penicillin is often given to treat many infections generated by common bacteria such as clostridium, listeria genera, streptococci, and staphylococci.


Penicillin is often given as a tablet or suspension. Your medical condition, age, allergies, and health status will dictate whether or not penicillin is safe for your use and your doctor will decide. If your doctor decides penicillin is a good option for your treatment, he or she will prescribe the drug with precise dosage instructions. Always follow your doctor's directions exactly. Consult with your compounding pharmacist if you have further questions during your course of treatment. If anything is concerning you, see your doctor.


Some patients taking penicillin may experience side effects. Common side effects seen with penicillin are listed below. This list is not comprehensive and you may experience a side effect, or multiple side effects, not listed herein. Talk to your doctor about what to watch for and be prepared with a plan of action on how to respond if you experience any side effects.

  • Dermatitis
  • Angioedema
  • Neurotoxicity
  • Pseudomembranous Colitis
  • Diarrhea
  • Vomiting
  • Nausea
  • Rash
  • Urticaria
  • Serum Sickness
  • Serum Sickness-Type Reaction
  • Hypersensitivity
  • Fever
  • Headache
  • Erythema
  • Seizures
  • Sore Mouth
  • Sore Tongue

Other side effects are possible. Always seek medical assistance if you feel it is warranted, and certainly if you experience any side effects that seem to be increasing in intensity and/or lingering. If you are concerned about any side effect, see your doctor right away. If any side effect experienced feels severe, get emergency medical help immediately.


Anaphylaxis is a dangerous allergic reaction that could possibly arise very quickly and, in some cases, could potentially be fatal. If you experience any of the following symptoms or signs, get emergency medical help immediately:

  • Lightheadedness
  • Low Blood Pressure
  • Shortness of Breath
  • Itchy Rash
  • Vomiting
  • Throat and/or Tongue Swelling

IMPORTANT NOTE/WARNING: As some of penicillin's known common side effects overlap with some of the signs of anaphylaxis, never assume that what you are experiencing will subside, or that it is common. If you experience anything that could be a potential sign of anaphylaxis, get emergency medical help immediately. Anaphylaxis can be fatal.


If you are considering the use of penicillin, consult with your doctor. Make sure that he or she is aware of your medical history and of any medications that you are currently using or have used in the past.

There are many possible contraindications for the use of penicillin. Talk to your doctor and discuss all possible contraindications. Your doctor will decide if penicillin is safe for your use.

Penicillin may be contraindicated for anything listed below. Talk to your doctor before using penicillin if any of the following applies to you:

  • Allergy to Penicillins
  • Allergy to Betalactams
  • Severe Renal Impairment
  • Clostridium Difficile Infection
  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA