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.
Get emergency medical help if you have any of these signs of an allergic
reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
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.
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