TweetKetotifen is currently used as an antihistamine, which works to alleviate allergy symptoms. Now, what does this mean to a bodybuilder who is trying to reduce body fat? Ketotifen has a second unique mechanism of action by its powerful effect to up regulate the body's beta-adrenergenic receptors, primarily the beta-2 receptors.

This unique property makes it an extremely effective compound to use when combined with clenbuterol. When using clenbuterol the body's beta-2-adrenergic receptors down regulate very quickly only making clenbuterol a useful fat burner for two week cycles. When implementing a drug like ketotifen the rules are broken, allowing bodybuilders to use clenbuterol for cycles of twelve weeks or longer.

A normal dosage for ketotifen is usually 2-3 mg per day (two to three 1 mg tablets) to prevent the usual down regulation that is often seen with the use of clenbuterol. Some side-effects may occur with the use of ketotifen due to the drugs antihistamine properties. These include, appetite stimulation, weight gain, and drowsiness. But these are usually not seen often with the usual dose of 2-3mg per day used by bodybuilders.