Antazoline

An article about the antihistamine drug Antazoline

Chemical structure of Antazoline

Antazoline is a first-generation antihistamine with anticholinergic properties. It is primarily used in the treatment of allergic conjunctivitis and other allergic conditions. Antazoline is often combined with naphazoline, a vasoconstrictor, to enhance its effectiveness in reducing eye redness and itching.

Pharmacology

Antazoline works by blocking the action of histamine, a substance in the body that causes allergic symptoms. As an H1 receptor antagonist, it prevents histamine from binding to its receptors, thereby reducing symptoms such as itching, swelling, and redness.

Mechanism of Action

Antazoline competes with histamine for binding at the H1 receptor sites on effector cells in the gastrointestinal tract, blood vessels, and respiratory tract. This competitive inhibition prevents the typical allergic response mediated by histamine.

Uses

Antazoline is commonly used in the form of eye drops to relieve symptoms of allergic conjunctivitis. It is effective in reducing ocular itching and redness.

Side Effects

Common side effects of antazoline include dry mouth, drowsiness, and blurred vision. Due to its anticholinergic effects, it may also cause urinary retention and constipation.

Contraindications

Antazoline should be used with caution in patients with glaucoma, prostatic hypertrophy, or bladder neck obstruction due to its anticholinergic properties.

Related pages

• Antihistamine
• Allergic conjunctivitis
• H1 receptor antagonist