Unfortunately, there's absolutely no one who will tell you yes to this for legal reasons. The Singulair website says "Singulair may cause drowsiness or dizziness. These effects may be worse if you take it with alcohol or certain medicines. Use Singulair with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it."
It also says to discuss whether it's a good medication for you if you drink alcohol. There's absolutely no information about how much alcohol they mean. Obviously drinking large amounts of alcohol on a daily basis is totally different than having a drink with the girls.
That said there's also nothing on the website that says "DO NOT DRINK ALCOHOL WHILE TAKING THIS MEDICATION."
Your best bet is to discuss this with your doctor taking all of your medical history and medication history into account.
Best of Luck - Stephanie
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