Synthetic drugs, brompheniramine (Dimetapp) act as antihistamines.

Antihistamines are drugs which treat hay fever and other allergies. Typically, people take antihistamines as an inexpensive, not patented, drug that can be bought without a prescription and relieves from nasal congestion, sneezing, or hives caused by pollen, dust mites, or animal allergy with few side effects.

We know that drugs help us diagnose and cure numerous illnesses. But any drug consumed by humans can actually have two kinds of effects - therapeutic effects and side effects. The goal is to prescribe the ideal drug, the one that only has a therapeutic effect.