Others have already provided good answers but I feel there are some facts that need to be stated a little more forcefully. Alcohol is accepted in many societies for cultural/historical reasons (and, living in such a society, I like it as much as the next guy) but it's pretty bad all around. Pills (at least those that are classified as medication) will have a much more controlled effect and dosage and should have been evaluated for their risk/benefit balance. Do consult a doctorphysician but as far as toxicity is concerned pills win hands down on alcohol, it's not even a close call.
And two shots of whisky an hour is really a lot. If you can walk and speak normally after a long-haul flight at this regimen, chances are you consume quite a lot of alcohol even when you're not flying and that's not good for your health either.