From Longman Dictionary of Contemporary Englishantihistaminean‧ti‧his‧ta‧mine /ˌæntɪˈhɪstəmiːn, -mɪn/ noun [countable, uncountable] MDa drug that is used to treat an allergy (=an unpleasant reaction to particular foods, substances etc)
Examples from the Corpus
antihistamine• Discovered the first antihistamine, a drug effective against allergies, 1944.• Right next to me was a bottle of antihistamines, and I just ate up the whole bottle.• If you or your child are affected it is worth asking the doctor to change you to another type of antihistamine.• Unlike many other antihistamines, Claritin does not cause drowsiness and is taken only once a day.• Seldane was first introduced in 1985, the first prescription antihistamine to relieve hayfever symptoms without drowsiness.• Gladman said that Seldane and Seldane D have less than 10 percent of the prescription antihistamine market.• Treatment with sedative antihistamines was continued throughout the study if they were in use on entry.• Interest in plant derived antiulcer drugs declined following the success of synthetic antihistamine drugs in the 1970s. 