Antihistamine / opioid combinations are used to treat cough, cold symptoms, and allergies. These medications work by combining the effects of an antihistamine, which reduces allergy symptoms, and an opioid, which helps to suppress the cough reflex. These medications come in oral forms, such as tablets, capsules, and syrups. Examples include hydrocodone / chlorpheniramine (Tussionex, Tussicaps) and codeine / chlorpheniramine (Tuzistra XR, Tuxarin ER). You can discuss which option might be right for you with your healthcare team.