The compound 2-methylthio-6-fluoro-9(1-methyl-4-piperidylidene)-thioxanthene of the formula: …CHEM… and its non-toxic acid addition salts have been shown in animal experiment to possess very strong and longlasting neuroleptic properties and at the same time, a low degree of undesired side effects such as extrapyrimidal side effects. They also have a low acute toxicity which makes the therapeutic index favourable. …??Moreover, they have strong anticholinergic effects. …??The compound may conveniently be prepared by dehydrating 82-methylthio-6-fluoro-9-(1-methyl-4-piperidylidene)-thioxanthen-o1-9 of the formula: …CHEM… by conventional means. …??The compound of formula I and its acid addition salts may be administered in the form of tablets, capsules, powders, syrups, suppositories or solutions for injection.
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