Abstract
The crude drugs are being use since ADAM & EVE'S era. Descorides (100 A.D.), who is founder of Unani Pharnmacognosy (Ilmul Advia), He defined many ethics for production of crude drugs in Unani System of Medicine (USM), later many scholars of USM revealed the various methods. The crude drugs on reaching the pharmaceutical manufacturing line will have to pass through various stages, all of which influence the nature and amount of active constituents present. Its environmental conditions, cultivations, collections, drying and storage are the various aspects in usage of drugs.
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