According to Drugs.com, cephalexin should be used with caution in combination with alcohol. Drinking alcohol while taking cephalexin (brand name Keflex) may increase some of the medication's side effects.
Cephalexin is a cephalosporin antibiotic used to treat certain types of bacterial infections. It has side effects that include diarrhea, headache, dizziness and indigestion.
Drinking alcohol while taking cephalexin is not known to cause an adverse reaction. However, a patient may experience dizziness while taking this antibiotic, and drinking alcohol might make the dizziness worse.
Dizziness can impair cognitive and motor skills. People taking cephalexin should not perform any tasks that could be unsafe until they know how their bodies will react to the medication.