User:Mr. Ibrahem/Tetryzoline

Tetryzoline, also known as tetrahydrozoline, is a medication used to improve swelling of the whites of the eyes. It is available alone and in combination as an over-the-counter eye drop. Effects begin within minutes and may last for up to 8 hours. Long term use may worsen the condition.

Common side effects include dilated pupils, blurry vision, and irritation of the eyes. Other side effects may include redness of the eyes, headache, palpitations, and trouble sleeping. It works by causing blood vessels to contract by activation α-adrenergic receptors.

Tetryzoline was patented in 1954 and came into medical use in 1959. In the United States a bottle costs about 10 USD as of 2021. It is sold under many brand names including Visine and Rohto.