FLEXIMUV PAIN RELIEVER

Indications

• Topical pain relief
• Muscle aches
• Joint pain
• Inflammation

Dosage

Children: For children, the

Adults: For topical application, camphor is usually applied as needed to the affected area, following the instructions on the specific product used. Consult the product label or a healthcare professional for detailed dosing guidelines.

Mechanism of action

Camphor activates the transient receptor potential vanilloid 1 (TRPV1) and TRPV3 channels, which are involved in sensing pain and temperature. It requires higher concentrations to activate TRPV1 compared to capsaicin but notably desensitizes TRPV1 more rapidly and completely. This action is enhanced under inflamed conditions through phospholipase C-coupled receptor stimulation. The distinct activation pathways of camphor contribute to its analgesic effects, making it effective in reducing pain sensitivity.

Pharmacodynamics

The pharmacodynamic properties of camphor are primarily related to its interaction with TRPV1 and TRPV3 channels. By activating these receptors, camphor induces a sensation of warmth and can result in analgesia through sensory nerve excitation and subsequent desensitization. This mechanism is similar to that of other topical analgesics like capsaicin and menthol but is characterized by a faster desensitization of TRPV1. Additionally, camphor's effects may include local vasodilation and increased blood flow to the area of application, which can further alleviate pain and inflammation.

Pharmacokinetics

Camphor is absorbed through the skin when applied topically. Its pharmacokinetic profile involves distribution to various tissues, where it can exert local effects. The metabolism of camphor occurs primarily in the liver, and it is eliminated from the body mainly through urine. The onset of action is typically rapid due to its topical application, and the duration of effect may vary depending on the formulation and concentration used.

Adverse effects

• Skin irritation
• Allergic reactions
• Nausea
• Vomiting
• Dizziness

Precautions

• Use with caution in individuals with sensitive skin
• Avoid contact with eyes and mucous membranes
• Do not apply to broken or irritated skin
• Keep out of reach of children

Pregnancy

Camphor should be used with caution during pregnancy. It is advisable to consult a healthcare professional before use.

Breast-feeding

Camphor should be used with caution while breastfeeding. Consult a healthcare professional for advice.

Storage

Store in a cool, dry place, away from direct sunlight and heat.

Formulations

• Topical ointments
• Liniments
• Creams
• Gels

Indications

• Topical pain relief for conditions such as osteoarthritis and neuropathic pain
• Management of postherpetic neuralgia
• Supportive treatment for muscle and joint pain
• Stimulation of digestion and appetite

Dosage

Children: Dosage for pediatric patients should be determined by a healthcare provider, taking into consideration

Adults: Topical formulations generally recommend application to the affected area, with specific dosing instructions provided by the product label. For oral supplements, follow the manufacturer's guidelines or consult a healthcare professional.

Mechanism of action

Capsaicin, the main active component in Capsicum, exerts its effects by binding to the TRPV1 (transient receptor potential vanilloid 1) receptor, which is a cation channel involved in the transmission of pain and heat sensations. This binding leads to the depolarization of sensory neurons, resulting in the release of substance P, a neuropeptide associated with pain signaling. Continuous exposure to capsaicin results in the desensitization of these receptors, leading to decreased pain perception over time.

Pharmacodynamics

The analgesic properties of Capsicum are attributed to its ability to alter the perception of pain. Capsaicin induces a sensation of warmth and pain initially, which is followed by a prolonged analgesic effect due to the depletion of substance P from the nerve endings. Additionally, Capsicum may exhibit anti-inflammatory effects through the modulation of cytokine release and inhibition of inflammatory pathways, contributing to its therapeutic applications in pain management and inflammatory conditions.

Pharmacokinetics

Capsaicin is poorly absorbed when ingested orally, but it can be effectively absorbed through the skin when applied topically. After application, it is metabolized by the liver, and its metabolites are excreted primarily through the kidneys. The onset of action for topical preparations can vary, with effects often observed within hours. The duration of action may last from several hours to days, depending on the formulation and the area of application.

Adverse effects

• Burning sensation at the site of application
• Skin irritation or rash
• Gastrointestinal upset (if ingested)
• Allergic reactions

Precautions

• Avoid contact with eyes and mucous membranes
• Use caution in patients with sensitive skin
• Consult a healthcare professional before use in patients with underlying health conditions

Pregnancy

Capsicum is generally considered unsafe during pregnancy due to potential effects on the fetus. Pregnant women should consult a healthcare provider before use.

Breast-feeding

Capsicum should be used with caution during breastfeeding as it may affect milk production or flavor.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Topical ointments or creams
• Capsules
• Powdered form for oral use

Indications

• Topical analgesic for muscle and joint pain
• Cough suppressant in cough drops and lozenges
• Relief of minor throat irritation
• Cooling agent in various cosmetic and personal care products

Dosage

Children: Refer to BNF for Children for specific dosing guidelines, as doses may vary based on age and formulation.

Adults: For topical use, apply a thin layer to the affected area not more than 3 to 4 times daily. For cough drops, follow the product-specific instructions as per the formulation.

Mechanism of action

Menthol acts as an agonist for the transient receptor potential subtype M8 (TRPM8), a non-selective cation channel that is activated by cold temperatures. This activation leads to calcium influx in mast cells, inducing the release of histamine, which can trigger allergic responses such as urticaria, asthma, and rhinitis. Menthol's ability to induce histamine release via TRPM8 suggests potential therapeutic applications for TRPM8 antagonists in managing cold- and menthol-induced allergies.

Pharmacodynamics

Menthol produces a cooling effect by stimulating sensory neurons that convey cold sensations. It interacts with TRPM8 channels, leading to the activation of intracellular signaling pathways that can result in vasodilation and increased blood flow to the area of application. This cooling sensation can provide symptomatic relief in conditions characterized by pain or irritation.

Pharmacokinetics

Menthol is absorbed through the skin and mucous membranes, with systemic effects depending on the route of administration. Its bioavailability can vary, and it is metabolized primarily in the liver. The elimination half-life and excretion pathways have not been extensively characterized, but menthol is generally considered to have a rapid onset of action with effects lasting for a few hours.

Adverse effects

• Allergic reactions
• Urticaria
• Asthma
• Rhinitis
• Skin irritation

Precautions

• Use with caution in patients with known allergies to menthol or related compounds
• May exacerbate asthma in sensitive individuals

Pregnancy

There are no well-controlled studies of menthol in pregnant women. Menthol should be used during pregnancy only if clearly needed.

Breast-feeding

Menthol is excreted in breast milk. Caution should be exercised when administering to nursing mothers.

Storage

Store in a cool, dry place away from light. Keep out of reach of children.

Formulations

• Topical ointment
• Cream
• Liquid

Indications

• Mood disorders
• Chronic pain
• Anxiety disorders
• Neuropathic pain

Dosage

Children: Specific dosing information for paediatric patients is not established. Refer to clinical guidelines and pharmacological references for dosage recommendations.

Adults: Specific dosing information for adults is not established. Refer to clinical guidelines and pharmacological references for dosage recommendations.

Mechanism of action

Tupentine is believed to exert its effects through modulation of neurotransmitter systems in the brain, particularly influencing the levels of serotonin and norepinephrine. This action may contribute to its potential applications in treating mood disorders, pain syndromes, and possibly other conditions characterized by dysregulation of these neurotransmitters.

Pharmacodynamics

The pharmacodynamics of tupentine involve its interaction with specific receptors in the central nervous system, leading to altered synaptic transmission. This may result in anxiolytic, antidepressant, or analgesic effects, depending on the targeted pathways. The full range of effects and the optimal therapeutic window remain to be fully characterized in clinical studies.

Pharmacokinetics

The pharmacokinetics of tupentine, including its absorption, distribution, metabolism, and excretion, have not been thoroughly studied. Preliminary data suggest that it may have a moderate bioavailability with a half-life that allows for once-daily dosing. Further research is needed to elucidate its pharmacokinetic profile and potential interactions with other medications.

Pregnancy

Safety during pregnancy has not been established. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known whether tupentine is excreted in human milk. Caution should be exercised when administering to nursing mothers.

Storage

Store at room temperature, away from light and moisture. Keep out of reach of children.

Indications

• Musculoskeletal pain
• Arthritis
• Tendinitis
• Back pain
• Muscle strains and sprains

Dosage

Children: Refer to the BNF for Children for specific dosing guidelines.

Adults: Apply to the affected area, usually 3 to 4 times daily as needed, ensuring not to exceed the recommended amount.

Mechanism of action

Counter-irritation is thought to be effective at alleviating musculoskeletal pain as the irritation of the sensory nerve endings alters or offsets pain in the underlying muscle or joints served by the same nerves. When applied topically, methyl salicylate penetrates the skin and underlying tissues, where it reversibly inhibits cyclooxygenase enzyme and prevents the production of inflammatory mediators such as prostaglandin and thromboxane A2.

Pharmacodynamics

Methyl salicylate relieves musculoskeletal pain in muscles, joints, and tendons by causing irritation and reddening of the skin due to dilated capillaries and increased blood flow. It acts as a rubefacient and skin irritant, providing a soothing sensation of warmth. Its pharmacological profile is similar to that of aspirin and other NSAIDs.

Pharmacokinetics

Methyl salicylate is absorbed through the skin upon topical application, where it exerts its effects locally. It undergoes metabolism primarily in the liver, and its metabolites are excreted via urine. The onset of action is relatively rapid, given the local application.

Adverse effects

• Skin irritation
• Allergic reactions
• Burning sensation at the application site

Precautions

• Avoid contact with eyes and mucous membranes
• Do not apply to broken or irritated skin
• Use with caution in patients with sensitive skin or allergies

Pregnancy

Data on the safety of wintergreen during pregnancy is limited. Consult a healthcare professional before use.

Breast-feeding

Limited data available; consult a healthcare professional before use.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Topical ointment
• Topical gel
• Liniment

Mechanism of action

Camphor is a naturally occurring compound that is used as a major active ingredient of balms and liniments supplied as topical analgesics. ... Capsaicin and menthol, two other topically applied agents widely used for similar purposes, are known to excite and desensitize sensory nerves by acting on two members of transient receptor potential (TRP) channel superfamily: heat-sensitive TRP vanilloid subtype 1 (TRPV1) and cold-sensitive TRP channel M8, respectively. Camphor has recently been shown to activate TRPV3, and here /investigators/ show that camphor also activates heterologously expressed TRPV1, requiring higher concentrations than capsaicin. Activation was enhanced by phospholipase C-coupled receptor stimulation mimicking inflamed conditions. Similar camphor-activated TRPV1-like currents were observed in isolated rat DRG neurons and were strongly potentiated after activation of protein kinase C with phorbol-12-myristate-13-acetate. Camphor activation of rat TRPV1 was mediated by distinct channel regions from capsaicin, as indicated by camphor activation in the presence of the competitive inhibitor capsazepine and in a capsaicin-insensitive point mutant. Camphor did not activate the capsaicin-insensitive chicken TRPV1. TRPV1 desensitization is believed to contribute to the analgesic actions of capsaicin. /The authors/ found that, although camphor activates TRPV1 less effectively, camphor application desensitized TRPV1 more rapidly and completely than capsaicin. Conversely, TRPV3 current sensitized after repeated camphor applications, which is inconsistent with the analgesic role of camphor. /Investigators/ also found that camphor inhibited several other related TRP channels, including ankyrin-repeat TRP 1 (TRPA1). The camphor-induced desensitization of TRPV1 and block of TRPA1 may underlie the analgesic effects of camphor.

Mechanism of action

Exposure to low temperatures often causes allergic responses or urticaria. Similarly, menthol, a common food additive is also known to cause urticaria, asthma, and rhinitis. However, despite the obvious clinical implications, the molecular mechanisms responsible for inducing allergic responses to low temperatures and menthol have not been determined. Because a non-selective cation channel, transient receptor potential subtype M8 (TRPM8) is activated by cold and menthol, we hypothesized that this channel mediates cold- and menthol-induced histamine release in mast cells. Here, we report that TRPM8 is expressed in the basophilic leukemia mast cell line, RBL-2H3, and that exposure to menthol or low temperatures induced Ca(2+) influx in RBL-2H3 cells, which was reversed by a TRPM8 blocker. Furthermore, menthol, a TRPM8 agonist, induced the dose-dependent release of histamine from RBL-2H3 cells. When TRPM8 transcripts were reduced by siRNA (small interfering RNA), menthol- and cold-induced Ca(2+) influx and histamine release were significantly reduced. In addition, subcutaneous injection of menthol evoked scratching, a typical histamine-induced response which was reversed by a TRPM8 blocker. Thus, our findings indicate that TRPM8 mediates the menthol- and cold-induced allergic responses of mast cells, and suggest that TRPM8 antagonists be viewed as potential treatments for cold- and menthol-induced allergies. /DL-Menthol/ Menthol's characteristic cooling sensation is due, in part, to the activation of sensory neurons generally termed transient receptor potential (TRP) channels, in particular transient receptor potential melastatin family member 8 (TRPM8) and transient receptor potential subfamily A, member 1 (TRPA1). Menthol acts upon TRPM8 receptors by rapidly increasing intracellular calcium and mobilizing calcium flux through the channels to induce cold response signals at the application site. Aside from its cold-inducing sensation capabilities, menthol exhibits cytotoxic effects in cancer cells, induces reduction in malignant cell growth, and engages in synergistic excitation of GABA receptors and sodium ion channels resulting in analgesia. /DL-Menthol/ In recent years, the transient receptor potential melastatin member 8 (TRPM8) channel has emerged as a promising prognostic marker and putative therapeutic target in prostate cancer. We have found that forced overexpression of TRPM8 in PC-3 cells can inhibit the cell proliferation and motility probably through the TRPM8 activation. In this study, we aimed to investigate whether activating the TRPM8 channel by its selective agonist menthol can inhibit the proliferation and motility of androgen-independent prostate cancer (AIPC) with remarkable expression of TRPM8. Menthol is a naturally occurring compound, which has been widely used in cosmetics and pharmaceutical products, and also as flavoring in food. DU145 cells are androgen-independent but have a remarkable expression of TRPM8. The demonstration of the existence of TRPM8 and the absence of TRPA1 in DU145 cells provided the foundation for the following experiments, because both TRPM8 and TRPA1 are molecular targets of menthol. The outcome of MTT assay indicated that menthol inhibited the cell growth (p < 0.01). Cell cycle distribution and scratch assay analysis revealed that menthol induced cell cycle arrest at the G(0)/G(1) phase (p < 0.01). Furthermore, menthol inhibited the migration of DU145 cells by downregulating the focal-adhesion kinase. So it suggests that the activation of the existing TRPM8 channels may serve as a potential and pragmatic treatment for those AIPC with remarkable expression of TRPM8, and menthol is a useful compound for future development as an anticancer agent. /DL-Menthol/

Mechanism of action

Counter-irritation is thought to be effective at alleviating musculoskeletal pain as the irritation of the sensory nerve endings is thought to alter or offset pain in the underlying muscle or joints that are served by the same nerves. This is thought to mask the underlying musculoskeletal pain and discomfort. When applied topically, methyl salicylate is thought to penetrate the skin and underlying tissues where it reversibly inhibits cyclooxygenase enzyme and locally and peripherally prevents the production of inflammatory mediators such as prostaglandin and thromboxane A2.

Pharmacodynamics

Methyl salicylate relieve musculoskeletal pain in the muscles, joints, and tendons by causing irritation and reddening of the skin due to dilated capillaries and increased blood flow. It is pharmacologically similar to aspirin and other NSAIDs but as a topical agent it primarily acts as a rubefacient and skin irritant. Counter-irritation is believed to cause a soothing sensation of warmth.