Pimethixene is primarily used as an antihistamine with anticholinergic properties. It is effective in treating allergic conditions such as rhinitis, conjunctivitis, and skin allergies by blocking histamine receptors, thereby reducing symptoms like itching, sneezing, and watery eyes. Additionally, its anticholinergic effects make it useful in managing symptoms of Parkinson's disease, such as tremors and rigidity, by inhibiting the action of acetylcholine in the central nervous system. Pimethixene is also employed as a sedative in certain cases, helping to alleviate anxiety and promote sleep due to its calming effects on the nervous system. Its dual action makes it a versatile medication in both allergic and neurological conditions.