Animal experiments show that certain plants and their extracts can raise the pain threshold. These medicinal plants could be useful in treating painful conditions by raising the pain threshold:
Acanthopanax giraldii
Amaranthus hybridus
Amomum villosum
Angelica pubescens
Betula platyphylla
Boswellia carterii
Byrsonima intermedia
Camellia sinensis
Celastrus orbiculatus
Cimicifuga rhizoma
Cissampelos pareira
Clerodendron colebrookianum
Cnidium monnieri
Cnidoscolus aconitifolius
Commiphora myrrha
Coptis chinensis
Corchorus olitorius
Crassocephalum bauchiense
Cyathula prostrata
Cynanchum paniculatum
Cyperus rotundus
Emblica officinalis
Enhydra fluctuans
Ficus bengalensis
Fumaria indica
Ganoderma sinense
Gingko biloba
Hedychium coronarium
Heliopsis longipes
Hunteria zeylanica
Hygrophila difformis
Hypericum caprifoliatum
Hypericum perforatum
Hypericum polyanthemum
Juniperus oxycedrus
Ligusticum wallichii
Melastoma malabathricum
Melissa officinalis
Mitragyna speciosa
Muntingia calabura
Myracrodruon urundeuva
Myrica rubra
Olea europaea
Paeonia lactiflora
Panax ginseng
Panax notoginseng
Pantoea agglomerans
Phyllanthus amarus
Phyllanthus niruri
Premna corymbosa
Prunus cerasus
Prunus domestica
Pterodon pubescens
Punica granatum
Rheum rhabarbarum
Salvia limbata
Salvia miltiorrhiza
Schwenckia americana
Senna spectabilis
Sipunculus nudus
Spirulina platensis
Tabebuia avellanedae
Terminalia arjuna
Thymus broussonetii
Trifolium pratense
Vaccinium ashei
Zingiber officinale
Zingiber zerumbet
References:
An experimental observation on the analgesic and antipyretic effects and toxicity of Acanthopanax giraldii Harms. (Link)
Analgesic activity of myricetin isolated from Myrica rubra Sieb. et Zucc. leaves. (Link)
Analgesic and anti-inflammatory effects in animal models of an ethanolic extract of Taheebo, the inner bark of Tabebuia avellanedae. (Link)
Analgesic and antiinflammatory effects of chalcones isolated from Myracrodruon urundeuva allemão. (Link)
Analgesic effect and gastro-intestinal motility inhibitory action of 3-hydroxy-4-methoxy-acetophenone from Cynanchum paniculatum (Bunge) Kitagawa. (Link)
Analgesic effect of Coptis chinensis rhizomes (Coptidis Rhizoma) extract on rat model of irritable bowel syndrome. (Link)
Analgesic effect of paeoniflorin in rats with neonatal maternal separation-induced visceral hyperalgesia is mediated through adenosine A(1) receptor by inhibiting the extracellular signal-regulated protein kinase (ERK) pathway. (Link)
Analgesic effects and anti-inflammatory properties of the crude methanolic extract of Schwenckia americana Linn (Solanaceae). (Link)
Anti-inflammatory and analgesic actions of artificial and fermentative Ganoderma sinense (AFGS). (Link)
Anti-inflammatory and analgesic activity of different extracts of Commiphora myrrha. (Link)
Anti-inflammatory and analgesic activity of Indian Hypericum perforatum L. (Link)
Anti-inflammatory and analgesic effects of Hedychium coronarium Koen. (Link)
Anti-inflammatory and analgesic properties of the ethanolic extract of Cnidoscolus aconitifolius in rats and mice. (Link)
Anti-inflammatory and anti-nociceptive activities of Fumaria indica whole plant extract in experimental animals. (Link)
Anti-inflammatory and anti-nociceptive activities of Sipunculus nudus L. extract. (Link)
Anti-inflammatory and anti-nociceptive effect of Betula platyphylla var. japonica in human interleukin-1β-stimulated fibroblast-like synoviocytes and in experimental animal models. (Link)
Anti-inflammatory and antinociceptive effects of the stem bark of Byrsonima intermedia A. Juss. (Link)
Anti-inflammatory, immunomodulatory and antinociceptive activity of Terminalia arjuna Roxb bark powder in mice and rats. (Link)
Antiinflammatory and antiallodynic actions of the lignan niranthin isolated from Phyllanthus amarus. Evidence for interaction with platelet activating factor receptor. (Link)
Antiinflammatory and antihyperalgesic activity of C-phycocyanin. (Link)
Antiinflammatory, analgesic and antioxidant activities of Cyathula prostrata (Linn.) Blume (Amaranthaceae). (Link)
Antinociceptive activity and effect of methanol extract of Salvia limbata on withdrawal syndrome in mice. (Link)
Antinociceptive activity of Hypericum caprifoliatum and Hypericum polyanthemum (Guttiferae). (Link)
Antinociceptive activity of Premna corymbosa (Burm.f.)Rottl. & Willd. (Link)
Antinociceptive and antiarthritic activity of Cissampelos pareira roots. (Link)
Antinociceptive and antipyretic effects of alkaloids extracted from the stem bark of Hunteria zeylanica. (Link)
Antinociceptive and hypnotic properties of Celastrus orbiculatus. (Link)
Antinociceptive effect of 7-hydroxymitragynine in mice: Discovery of an orally active opioid analgesic from the Thai medicinal herb Mitragyna speciosa. (Link)
Antinociceptive effect of the essential oil of Zingiber zerumbet in mice: possible mechanisms. (Link)
Antinociceptive effects of systemic paeoniflorin on bee venom-induced various ‘phenotypes’ of nociception and hypersensitivity. (Link)
Antinociceptive, anti-inflammatory and antipyretic properties of Melastoma malabathricum leaves aqueous extract in experimental animals. (Link)
Antinociceptive, genotoxic and histopathological study of Heliopsis longipes S.F. Blake in mice. (Link)
Antipyretic, analgesic, anti-inflammatory and antioxidant activities of two major chromenes from Melicope lunu-ankenda. (Link)
Central and local administration of Gingko biloba extract EGb 761® inhibits thermal hyperalgesia and inflammation in the rat carrageenan model. (Link)
CNS activities of ethanol extract of aerial parts of Hygrophila difformis in mice. (Link)
Comparative study of the anti-inflammatory and antinociceptive effects of two varieties of Punica granatum. (Link)
Comparison of activities of various species of Rhizoma Cimicifugae and their honey processed products. (Link)
Drug effect comparison of Rhubarb extract by the technology free of heating and the extracts form crude Rhubarb and from prepared Rhubarb. (Link)
Effect and mechanism of senkyunolide I as an anti-migraine compound from Ligusticum chuanxiong. (Link)
Effects and mechanism of total saponins of Panax Notoginseng on anti-inflammation and analgesia. (Link)
Effects and mechanisms of osthole on sciatica induced by lumber disc herniation. (Link)
Effects of an acetone extract of Boswellia carterii Birdw. (Burseraceae) gum resin on rats with persistent inflammation. (Link)
Effects of treatment with St. John’s Wort on blood glucose levels and pain perceptions of streptozotocin-diabetic rats. (Link)
Emblica officinalis corrects functional, biochemical and molecular deficits in experimental diabetic neuropathy by targeting the oxido-nitrosative stress mediated inflammatory cascade. (Link)
Evaluation of analgesic activity of P. domestica L. (Link)
Evaluation of antinociceptive effects of Crassocephalum bauchiense Hutch (Asteraceae) leaf extract in rodents. (Link)
Evaluation of the anti-inflammatory and analgesic properties of individual and combined extracts from Commiphora myrrha, and Boswellia carterii. (Link)
Evaluation of the antinociceptive activity of Amaranthus hybridus Linn. root extracts. (Link)
Flavonoids of Enhydra Fluctuans exhibits analgesic and anti-inflammatory activity in different animal models. (Link)
GC-MS analysis and analgesic activity of essential oil from fresh rhizoma of Cyperus rotundus. (Link)
Ginger (Zingiber officinale Roscoe) elicits antinociceptive properties and potentiates morphine-induced analgesia in the rat radiant heat tail-flick test. (Link)
Ginsenoside Rf potentiates U-50,488H-induced analgesia and inhibits tolerance to its analgesia in mice. (Link)
Intracerebroventricular ginsenosides are antinociceptive in proinflammatory cytokine-induced pain behaviors of mice. (Link)
Mechanisms involved in the antinociception caused by ethanolic extract obtained from the leaves of Melissa officinalis (lemon balm) in mice. (Link)
Modulatory role of green tea extract on antinociceptive effect of morphine in diabetic mice. (Link)
Oleaginous extract from the fruits Pterodon pubescens Benth induces antinociception in animal models of acute and chronic pain. (Link)
Olive (Olea europaea L.) leaf extract elicits antinociceptive activity, potentiates morphine analgesia and suppresses morphine hyperalgesia in rats. (Link)
Osthole, a herbal compound, alleviates nucleus pulposus-evoked nociceptive responses through the suppression of overexpression of acid-sensing ion channel 3 (ASIC3) in rat dorsal root ganglion. (Link)
Pharmacological screening of different Juniperus oxycedrus L. extracts. (Link)
Pharmacological studies of Clerodendron colebrookianum Walp, a potent hypotensive plant. (Link)
Plant derived alkaloid (-)-cassine induces anti-inflammatory and anti-hyperalgesics effects in both acute and chronic inflammatory and neuropathic pain models. (Link)
Preliminary studies on the antinociceptive activity of Vaccinium ashei berry in experimental animal models. (Link)
Red clover Trifolium pratense (Linn.) isoflavones extract on the pain threshold of normal and ovariectomized rats–a long-term study. (Link)
Research on the analgesic effect and mechanism of bornyl acetate in volatile oil from amomum villosum. (Link)
Salvianolic acid B and its liposomal formulations: anti-hyperalgesic activity in the treatment of neuropathic pain. (Link)
Stem bark extraction of Ficus bengalensis Linn for anti-inflammatory and analgesic activity in animal models. (Link)
Studies on the analgesic and anti-inflammatory effect of bornyl acetate in volatile oil from Amomum villosum. (Link)
Study on the antinociceptive effects of Thymus broussonetii Boiss extracts in mice and rats. (Link)
Suppression of hyperalgesia in streptozotocin-induced diabetic mice by a lipopolysaccharide from Pantoea agglomerans. (Link)
Tart cherry anthocyanins suppress inflammation-induced pain behavior in rat. (Link)
The analgesic effect of paeoniflorin on neonatal maternal separation-induced visceral hyperalgesia in rats. (Link)
The anti-inflammatory and antinociceptive properties of the chloroform fraction from Phyllanthus niruri plant is mediated via the peripheral nervous system. (Link)
The antinociceptive action of aqueous extract from Muntingia calabura leaves: the role of opioid receptors. (Link)
The effects of Ginkgo biloba extract EGb 761 on mechanical and cold allodynia in a rat model of neuropathic pain. (Link)
The influences of temperature and naloxone on the antinociceptive activity of Corchorus olitorius L. in mice. (Link)