You should not drink alcohol while being on a Keflex treatment. Drinking alcohol while using Keflex may result in extra side effects, such as stomach pain, dizziness, nausea and vomiting.
Another very important factor to consider is the possibility of lessened effect fron the Keflex, making the treatment useless. If the treatment of your conditions is haltered by by alcohol consumption, it may get worse or require a completely different more extensive treatment.
Your healthcare provider will tell you to stay away from alcohol while taking Keflex.