According to Drugs.com, Keflex can be taken with alcohol. The only caveat is that the dizziness side effect of Keflex may be exacerbated when it is taken with alcohol. However, dizziness is listed as one of the less severe side effects. Keflex may be taken with or without food.
According to RxList.com, some of the more serious side effects include diarrhea, seizures, fever, abnormal weakness and decreased urination. Keflex's function is the treatment of bacterial infections. Some of the most common infections that Keflex is used for include urinary tract infections, ear infections, skin infections and upper respiratory infections. According to RxList.com, Keflex contains cephalexin, which is in the group of cephalosporin antibiotics.