Diphenhydramine is an antihistamine that is commonly used to relieve symptoms associated with allergies and allergic reactions.
It is available over-the-counter. In the United States, see brand name Benadryl. Be aware that some Diphenhydramine medications contain artificial colors that may affect individuals, so ask about colorless versions of the medication.
Key points:
Mechanism of Action: Diphenhydramine works by blocking the effects of histamine, a natural substance produced by the body during an allergic reaction.
Indications: It is used to relieve symptoms of allergies, including itching, rash, watery eyes, sneezing, and runny nose. It is also used to treat motion sickness, insomnia (as a sleep aid), and symptoms of the common cold.
Forms: It is available in various forms, including oral tablets, capsules, liquid, and as a topical cream.
Sedative Effect: Diphenhydramine has a sedative effect and can cause drowsiness. Because of this, it is often used as a sleep aid.
Timing: Effects typically last for 4-6 hours.
Side Effects: Common side effects may include drowsiness, dry mouth, blurred vision, constipation, or urinary retention. It may also cause excitability, especially in children.
Interactions: Diphenhydramine may interact with other medications, including central nervous system depressants.