MSD Manual

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Penicillins

Penicillins

Drug

Common Uses

Some Side Effects

Amoxicillin

Ampicillin

Carbenicillin

Cloxacillin

Dicloxacillin

Flucloxacillin

Nafcillin

Oxacillin

Penicillin G

Penicillin V

Piperacillin

Ticarcillin

Wide range of infections, including streptococcal infections, enterococcal infections, syphilis, and Lyme disease

Dicloxacillin, nafcillin, and oxacillin: Most often used to treat staphylococcal infections

Nausea, vomiting, and diarrhea*

Brain and kidney damage (rare)

* Almost any antibiotic can cause Clostridioides difficile–induced diarrhea and inflammation of the colon (colitis), but clindamycin, penicillins, cephalosporins, and fluoroquinolones are the most common causes.