All antihistamines that cause drowsiness must caution users about operating motor vehicles or heavy machinery. Claritin, on the other hand, is not required to carry such warnings. The ability to control your symptoms without feeling drowsy is just one of the reasons why Claritin has been the #1 prescribed antihistamine since September 1994.1 Claritin, when taken at the recommended dose can help you and your family manage your allergies without the inconvenience of drowsiness at work, home or play.