Federal law prohibits dispensing without prescription.
Butorphanol tartrate is a crystalline substance. One milligram of the salt is equivalant to 0.68 mg of the free base. It's interactions with these receptors in the central nervous system apparently mediate most of its pharmacologic effects, including analgesia. In addition to analgesia, CNS effects include depression of spontaneous respiratory activity and cough, stimulation of the emetic center, miosis and sedation. Effects possibly mediated by non-CNS mechanisms include alteration in cardiovascular resistance and capacitance, bronchomotor tone, gastrointestinal secretory and motor activity and bladder sphincter activity.