User:Mr. Ibrahem/Chlorphenamine

Chlorphenamine (CP, CPM), also known as chlorpheniramine, is an antihistamine used to treat the symptoms of allergic conditions such as allergic rhinitis (hay fever). It is taken by mouth. The medication takes effect within 6 hours and lasts for about a day.

Common side effects include sleepiness, restlessness, and weakness. Other side effects may include dry mouth and wheeziness. There is no evidence of harm in the first two trimesters of pregnancy; though use is not recommended in later pregnancy. It is a first-generation antihistamine and works by blocking the H1 receptor.

Chlorphenamine was patented in 1948 and came into medical use in 1949. It is available as a generic medication and over the counter. In the United Kingdom 28 tablets of 4 mg costs the NHS about £2 as of 2021. This amount in the United States costs about 0.80 USD. It is present in many combination products and is commonly used.