Cinnarizine is an antihistamine and calcium channel blocker used to treat motion sickness and vertigo. Like many drugs, cinnarizine can have impurities, which are substances that are present in the drug that are not the active ingredient. These impurities can affect the safety, efficacy, and purity of the drug, and therefore, it is important to monitor and control the levels of impurities in cinnarizine. Common impurities in cinnarizine include related substances, degradation products, and residual solvents, which can be identified and quantified using analytical techniques such as high-performance liquid chromatography (HPLC) and gas chromatography (GC).
