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This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.
Compiled from 30 PubMed articles · model: gemma4:31b
Summary
Akuamma (Picralima nitida) is a West African plant used in traditional medicine for pain, fever, and various other ailments [PMID:24418074, PMID:33326237]. It contains several indole alkaloids that exhibit opioidergic and anti-inflammatory activities [PMID:33326237, PMID:40582228].
Background
Picralima nitida (Apocynaceae) is a plant indigenous to West Africa [PMID:24418074, PMID:41563345].
Traditional uses
In African folk medicine, various parts of the plant are used to treat fever, hypertension, jaundice, dysmenorrhea, gastrointestinal disorders, malaria [PMID:24418074], and cough [PMID:27168749]. The seeds are specifically used for rheumatic fever and as an antipyretic [PMID:24491645].
Active compounds
The plant contains alkaloids (including akuammine, akuammicine, akuammiline, picraline, pseudo-akuammigine, akuammidine, and alstonine), tannins, polyphenols, and steroids [PMID:24418074, PMID:33326237, PMID:40582228].
Mechanism of action
Akuamma alkaloids primarily target opioid receptors; specifically, akuammicine is a potent kappa opioid receptor agonist, while akuammine, pseudo-akuammigine, and akuammicine show micromolar activity at the mu opioid receptor [PMID:33326237]. Seed extracts also suppress PGE2 production by inhibiting COX-2 and mPGES-1 protein expressions and interfering with NF-κB transactivation and MAPK pathways (p38, ERK1/2, and JNK) [PMID:24491645]. Alstonine exhibits antipsychotic action without binding to D2 dopamine receptors [PMID:25636871].
Clinical evidence
Evidence DPain and Inflammation
Seed extracts and isolated alkaloids (e.g., pseudo-akuammigine) demonstrated antinociceptive and anti-inflammatory effects in animal models, including reduction of carrageenan-induced paw edema [PMID:12020930, PMID:32598312].
Evidence DColitis
Total crude alkaloidal extract of seeds protected against acetic acid-induced colonic injury in rats by decreasing mucosal ulceration and inflammatory cell infiltration [PMID:37249276].
Evidence DGastrointestinal Parasites
P. nitida extracts (500 mg/kg) showed significant anthelmintic potential against Heligmosomoides bakeri in rodents [PMID:38222486].
Evidence DDiabetes/Hyperglycemia
Aqueous seed extract improved dyslipidemia and hyperglycemia in high-fat high-fructose-fed rats [PMID:33163962], though another study found seed extract did not show hypoglycemic effects in alloxan-induced diabetic rats [PMID:19069874].
Evidence DAnaemia
Leaf extract produced a significant increase in hemoglobin, haematocrit, and red blood cells in phenyl hydrazine-induced anaemic rats [PMID:37599487].
Safety & adverse effects
A 90-day subchronic toxicity study in albino rodents was conducted to evaluate genotoxicity and safety, though specific results for these endpoints were not detailed in the provided abstract [PMID:30853649]. An aqueous extract of seed and leaf powder (WDP) showed no toxic effect in mice at 2,000 mg/kg [PMID:32598312].
Pregnancy & lactation
The herb is used traditionally in diabetic pregnancy [PMID:23565805], and its safety profile during pregnancy has been noted as a major concern for investigation [PMID:30853649].
Evidence summary
The current evidence is primarily based on in vitro studies and animal models (Level D), demonstrating significant pharmacological potential for analgesia, anti-inflammation, and antimicrobial activity, but lacks human clinical trials.
PubMed sources
1.PMID: 36517579 (2022) — Purification of aquaculture effluent using Picralima nitida seeds. · Scientific reports
2.PMID: 30853649 (2019) — Toxicological evaluation of Picralima nitida in rodents. · Journal of ethnopharmacology
3.PMID: 24418074 (2014) — Medicinal uses, phytochemistry and pharmacology of Picralima nitida (Apocynaceae) in tropical diseases: a review. · Asian Pacific journal of tropical medicine
4.PMID: 24491645 (2014) — Picralima nitida seeds suppress PGE2 production by interfering with multiple signalling pathways in IL-1β-stimulated SK-N-SH neuronal cells. · Journal of ethnopharmacology
5.PMID: 37599487 (2023) — Analysis of haematological effects of Picralima nitida.
Government sources
No direct government monograph is available for this herb. The content below is AI-generated and has not been verified against an authoritative government source. Use the search links to check official sources before relying on this information.
Methanol extract of seeds reduced gastric ulcers in aspirin-pylorus-ligation rat models [PMID:21771407].
· Pakistan journal of pharmaceutical sciences
6.PMID: 41563345 (2026) — Akuamma Seed (Picralima nitida) Use in the U.S.: Findings from a Web-Based Survey. · Journal of psychoactive drugs
7.PMID: 38222486 (2023) — In vivo anthelmintic potentials of Gongronema latifolium and Picralima nitida against gastrointestinal parasite (Heligmosomoides bakeri). · Helminthologia
8.PMID: 33326237 (2021) — Isolation and Pharmacological Characterization of Six Opioidergic Picralima nitida Alkaloids. · Journal of natural products
9.PMID: 40582228 (2025) — Comprehensive pharmacokinetics and ADME evaluation of Akuamma alkaloids. · Journal of chromatography. B, Analytical technologies in the biomedical and life sciences
10.PMID: 37249276 (2023) — Acetic acid-induced colitis modulating potential of total crude alkaloidal extract of Picralima nitida seeds in rats. · Immunity, inflammation and disease
11.PMID: 36827198 (2023) — Modified Akuamma Alkaloids with Increased Potency at the Mu-opioid Receptor. · Journal of medicinal chemistry
12.PMID: 32598312 (2020) — Aqueous extract of dry powder blend of seeds and leaves of Picralima nitida (Stapf) T. & H. Durand reduce pain and inflammation in animal models. · Journal of basic and clinical physiology and pharmacology
13.PMID: 9683021 (1998) — Opioid activity of alkaloids extracted from Picralima nitida (fam. Apocynaceae). · European journal of pharmacology
14.PMID: 21771407 (2011) — Antiulcer activity of methanolic extract and fractions of Picralima nitida seeds(Apocynacaea) in rats. · Asian Pacific journal of tropical medicine
15.PMID: 27168749 (2016) — Antitussive, expectorant and analgesic effects of the ethanol seed extract of Picralima nitida (Stapf) Th. & H. Durand. · Research in pharmaceutical sciences
16.PMID: 33163962 (2020) — Protective Role of Picralima nitida Seed Extract in High-Fat High-Fructose-Fed Rats. · Advances in pharmacological and pharmaceutical sciences
17.PMID: 32091210 (2020) — Molecular Networking Reveals Serpentinine-Related Bisindole Alkaloids from Picralima nitida, a Previously Well-Investigated Species. · Journal of natural products
18.PMID: 12020930 (2002) — Pseudo-akuammigine, an alkaloid from Picralima nitida seeds, has anti-inflammatory and analgesic actions in rats. · Journal of ethnopharmacology
19.PMID: 23957940 (2013) — The anti-shigellosis activity of the methanol extract of Picralima nitida on Shigella dysenteriae type I induced diarrhoea in rats. · BMC complementary and alternative medicine
20.PMID: 25636871 (2015) — Original mechanisms of antipsychotic action by the indole alkaloid alstonine (Picralima nitida). · Phytomedicine : international journal of phytotherapy and phytopharmacology
21.PMID: 38684042 (2025) — Secondary metabolites from the stem bark of Alstonia boonei and the seeds of Picralima nitida with antibacterial activities. · Natural product research
22.PMID: 19069874 (2007) — Screening of the seed of Picralima nitida for hypoglycaemic activity. · Pakistan journal of biological sciences : PJBS
23.PMID: 23855679 (2013) — Antioxidant and antidiabetic profiles of two African medicinal plants: Picralima nitida (Apocynaceae) and Sonchus oleraceus (Asteraceae). · BMC complementary and alternative medicine
24.PMID: 39605297 (2026) — Antiplasmodial and anti-trypanosomial monoterpene indole alkaloids from Picralima nitida. · Natural product research
25.PMID: 23565805 (2013) — Anti-hyperglycemic effects of three medicinal plants in diabetic pregnancy: modulation of T cell proliferation. · BMC complementary and alternative medicine