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Brand names: Belladonna and Opium
12.1 Mechanism of Action Belladonna/opium rectal suppository is a combination narcotic analgesic/antispasmodic agent. The belladonna extract component of the rectal suppository provides the active alkaloids atropine and scopolamine, while the opium component provides primarily morphine (among more than 20 alkaloids). The atropine alkaloid is parasympatholytic, exerting antispasmodic activity by relaxation of smooth muscle that is stimulated by the parasympathetic nervous system. The atropine alkaloid is also the dl isomer of l-hyoscyamine and exerts the same pharmacologic activity; however, it exerts about one-half the activity peripherally as l-hyoscyamine. Atropine activity also counteracts morphine induced smooth muscle spasm without affecting the analgesia. The morphine alkaloid of opium exerts analgesic activity by increasing the pain threshold and decreasing the sensitivity to pain. The oxidative dealkylated nor-metabolites of morphine begin the analgesic process. Additionally, t
Contraindications
13 documented side effects by frequency
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Dosage Forms
Tablet
Route
Rectal