What side effects can ampicillin cause?
Ampicillin (a penicillin antibiotic) can cause side effects ranging from mild stomach symptoms to allergic reactions. Commonly reported effects include gastrointestinal upset such as diarrhea and nausea. It can also cause skin reactions such as rash in some people.
More serious reactions are possible, including an allergic reaction (which can be life-threatening in rare cases) and severe skin reactions.
What are the most common ampicillin side effects?
The most common side effects tend to be:
- Diarrhea
- Nausea
- Vomiting
- Rash or itching
What are the signs of an allergic reaction to ampicillin?
Seek urgent medical care if you develop symptoms of a serious penicillin allergy, which may include:
- Hives
- Swelling of the face, lips, tongue, or throat
- Trouble breathing or wheezing
- Severe dizziness or fainting
These can occur soon after taking a dose.
When should you worry about severe skin reactions?
Stop taking ampicillin and get urgent medical help if you develop signs of severe skin or mucous membrane reactions, such as:
- Blistering or peeling skin
- Sores in the mouth or eyes
- A widespread rash with fever or feeling very ill
Can ampicillin cause diarrhea that’s more than “mild”?
Ampicillin can disrupt gut bacteria. If diarrhea is severe, watery, or persistent, or if it comes with fever or blood/mucus, contact a clinician promptly. This can be a sign of a more serious antibiotic-associated condition.
What side effects are related to drug interactions?
Ampicillin can interact with other medicines, which can increase risk of side effects or change how medicines work. If you tell me which other medications you take (including supplements), I can help identify common interaction concerns.
Who is at higher risk for side effects?
Risk can be higher if you:
- Have a history of penicillin or other beta-lactam allergy
- Have had antibiotic-associated diarrhea before
- Have significant underlying illness or take multiple medications
What should you do if you get a side effect?
- Mild stomach upset or a mild rash should be reported to your prescriber, especially if it worsens or doesn’t improve.
- Any signs of serious allergy or severe skin reactions require immediate medical care.
If you share your age, the dose you’re taking, how long you’ve been on it, and what side effect you’re experiencing, I can help you triage what’s most likely and what to do next.