Definition

1. Noun:
   • An antihistamine medication: Diphenhydramine is a pharmaceutical drug primarily used to treat symptoms of allergies, such as hay fever, which involve the nasal passages. It is also effective in preventing and treating motion sickness. Its mechanism involves blocking histamine, a substance in the body that causes allergic symptoms, and it possesses additional anticholinergic (muscarinic-inhibiting) and sedative properties.

Usage Examples

• Noun:
  • For my seasonal allergies, the doctor recommended taking diphenhydramine at night due to its sedative effect.
  • Before the long car ride, she took diphenhydramine to prevent motion sickness.

Advanced Usage

• "diphenhydramine citrate": A salt form of the medication, often used in over-the-counter sleep aids and cold medicines.

  • The liquid cold formula contains diphenhydramine citrate for symptom relief.

• "diphenhydramine overdose": Refers to the dangerous condition resulting from taking too much of the drug.

  • Symptoms of a diphenhydramine overdose can include severe drowsiness, hallucinations, and seizures.

Variants and Related Words

• Benadryl (n): A common brand/trade name for products containing diphenhydramine as the active ingredient.
  • She bought Benadryl to help with her itchy eyes.

Synonyms

• Antihistamine: A general class of drugs that block histamine, of which diphenhydramine is a specific type.
• Sedating antihistamine: Describes older antihistamines like diphenhydramine that cause drowsiness, as opposed to non-sedating varieties.

Related Phrases

• "first-generation antihistamine": A pharmacological classification for antihistamines like diphenhydramine that readily cross the blood-brain barrier, causing sedation.
  • Diphenhydramine is a classic example of a first-generation antihistamine.

Related Idioms

(This term is a specific pharmaceutical name and is not commonly used in idiomatic expressions.)

Noun

1. antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness