• diarrhea that is watery or bloody;

• seizure (convulsions);

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

• pale or yellowed skin, dark colored urine, fever, confusion or weakness;

• easy bruising or bleeding, unusual weakness;

• confusion, agitation, hallucinations (seeing things that are not there); or

• urinating less than usual or not at all.

Less serious side effects are more likely to occur, such as:

• mild nausea, vomiting, diarrhea;

• dizziness, tired feeling;

• joint pain; or

• vaginal itching or discharge.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

What other drugs will affect cephalexin?

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

• a blood thinner such as warfarin (Coumadin);

• meftormin (Fortamet, Glucophage, Riomet, Actoplus, Avandamet, Metaglip); or

• probenecid (Benemid).

If you are using any of these drugs, you may not be able to use cephalexin, or you may need dosage adjustments or special tests during treatment.

There may be other drugs not listed that can affect cephalexin. 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 has information about cephalexin written for health professionals that you may read.

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.