• fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;

• diarrhea that is watery or bloody;

• fever, chills, body aches, flu symptoms;

• easy bruising or bleeding, unusual weakness;

• urinating less than usual or not at all;

• agitation, confusion, unusual thoughts or behavior; or

• seizure (black-out or convulsions).

Less serious side effects may include

• nausea, vomiting, stomach pain;

• vaginal itching or discharge;

• headache;

• swollen, black, or "hairy" tongue; or

• thrush (white patches or inside your mouth or throat).

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

What other drugs will affect ampicillin?

Before taking ampicillin, tell your doctor if you are using any of the following drugs:

• allopurinol (Zyloprim);

• methotrexate (Rheumatrex, Trexall);

• probenecid (Benemid);

• a sulfa drug (such as Bactrim or Septra); or

• a tetracycline antibiotic such as demeclocycline (Declomycin), doxycycline (Adoxa, Doryx, Oracea, Vibramycin), minocycline (Dynacin, Minocin, Solodyn, Vectrin), or tetracycline (Brodspec, Panmycin, Sumycin, Tetracap).

This list is not complete and there may be other drugs that can interact with ampicillin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about ampicillin.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.