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The dried seeds from this plant are used in traditional medicine throughout West Africa, particularly in Ghana as well as in the Ivory Coast and Nigeria. The seeds are crushed or powdered and taken orally, and are mainly used for the treatment of malaria and diarrhoea, and as a painkiller. An enterprising Ghanaian hospital started manufacturing standardised 250mg capsules of the powdered P. nitida seed, and sold them around the country where they became widely accepted as a safe and effective pain relief product. This then led researchers to try and discover the active component of the seeds.
P. nitida seeds contain a mixture of alkaloids producing antipyretic and antiinflammatory effects along with analgesia. Several of these were shown to bind to opioid receptors in vitro, and two compounds, akuammidine and ψ-akuammigine, were found to be potent μ-opioid agonists, although not particularly selective. Surprisingly the main alkaloid from the seeds, akuammine, was found to be an opioid antagonist when tested in vitro and canceled out the effects of the active agonist components.
Given the confirmed activity of the whole seed extract in humans, this makes it likely that akuammine is in fact being metabolised once inside the body to form an active metabolite, in a similar way to how the closely related compound mitragynine is metabolised to the more active 7-hydroxymitragynine.
Akuammine is the main alkaloid found in the seeds, comprising 0.56% of the dried powder, indicating that the 250 mg "Picap Capsules" sold commercially should contain approximately 1.4 mg of akuammine, plus 0.085 mg akuammidine and 0.015 mg ψ-akuammigine. Akuammine is structurally related to both yohimbine and mitragynine, both of which are alkaloid plant products with uses in medicine."