Doxycycline is a semi-synthetic antibiotic of a broad spectrum of tetracyclines. Causes bacteriostatic action by suppressing protein synthesis of pathogens as a result of blocking the aminoacyl transport RNA (tRNA) with the "information RNA (rRNA) complex" ribosome.

Kemadrin is a medicinal substance similar in its effect to atropine; It is used to reduce tremor and rigidity of muscles in Parkinsonism.