Introduction to Topical Analgesics
Topical analgesic ointments are medications applied directly to the skin to provide localized pain relief [1.3.5]. They are a popular choice for managing both acute pain, such as from sprains and muscle strains, and chronic pain, like that from osteoarthritis or neuropathy [1.5.4]. Unlike oral medications that circulate throughout the body, topical analgesics concentrate their effect at the site of pain, which can lead to fewer systemic side effects and drug interactions [1.6.2]. This makes them a particularly useful option for older adults or those with certain chronic conditions [1.6.2, 1.6.4]. These products come in various forms, including creams, gels, ointments, sprays, and patches [1.2.1].
How Do Analgesic Ointments Work?
Analgesic ointments relieve pain through several distinct mechanisms, depending on their active ingredients. They are absorbed through the skin to act on the tissues beneath [1.2.5].
- Counterirritation: Ingredients like menthol, camphor, and methyl salicylate create a sensation of cooling or heating on the skin [1.2.4]. This sensation distracts from the deeper pain in muscles and joints, essentially producing a less severe pain to counter a more intense one [1.2.1, 1.4.1].
- Reducing Inflammation (NSAIDs): Topical Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) such as diclofenac, ketoprofen, and ibuprofen work by inhibiting cyclooxygenase (COX) enzymes [1.4.1, 1.5.4]. This reduces the production of prostaglandins, which are compounds that cause pain and inflammation at the site of injury [1.2.1, 1.4.2]. Unlike counterirritants that just mask pain, topical NSAIDs treat the inflammation causing the pain [1.9.2].
- Depleting Substance P (Capsaicin): Capsaicin, the compound that makes chili peppers hot, is used for pain relief, especially nerve pain [1.10.1]. It initially causes a burning sensation by stimulating nerve receptors but, with repeated use, it depleles the nerves' supply of "substance P," a chemical that transmits pain signals to the brain. This desensitizes the nerve endings, leading to pain relief [1.4.3, 1.4.5]. It may take up to two weeks of regular use for capsaicin to become fully effective [1.2.1].
- Numbing (Anesthetics): Local anesthetics like lidocaine block nerve signals in the skin, producing a local numbing sensation that reduces pain [1.2.1, 1.11.2]. They are often used for minor cuts, burns, insect bites, and certain types of nerve pain like postherpetic neuralgia [1.11.1, 1.11.2].
Common Conditions Treated with Analgesic Ointments
Topical analgesics are used to treat a wide array of painful conditions affecting joints and muscles close to the skin's surface [1.5.1].
Common Uses:
- Acute Musculoskeletal Pain: This includes minor muscle aches, backaches, strains, sprains, and bruises [1.5.1, 1.5.4]. Topical NSAIDs like diclofenac and ketoprofen have shown good evidence of effectiveness for these conditions [1.5.2, 1.5.4].
- Chronic Joint Pain (Osteoarthritis): Analgesic ointments are frequently used for osteoarthritis pain, especially in the hands, knees, elbows, and ankles [1.6.4]. Topical diclofenac is FDA-approved for arthritis pain and has been shown to be effective [1.2.1, 1.5.2].
- Neuropathic (Nerve) Pain: Certain ointments can help with nerve-related pain. High-concentration capsaicin is used for postherpetic neuralgia (pain after shingles) and diabetic peripheral neuropathy [1.10.1, 1.5.4]. Lidocaine patches are also used to treat postherpetic neuralgia [1.5.3, 1.11.2].
Comparison of Analgesic Ointment Types
Type | Active Ingredients | Mechanism of Action | Best For | Example Brands |
---|---|---|---|---|
Counterirritants | Menthol, Camphor, Methyl Salicylate | Creates a heating or cooling sensation to distract from pain [1.4.1]. | Minor muscle/joint aches, strains [1.2.4]. | Bengay, Icy Hot, Tiger Balm [1.2.1, 1.3.4]. |
NSAIDs | Diclofenac, Ketoprofen, Ibuprofen | Reduces inflammation by blocking COX enzymes [1.4.1]. | Arthritis, sprains, strains (inflammation-related pain) [1.5.2, 1.6.4]. | Voltaren Gel, Fastum Gel [1.2.1, 1.3.2]. |
Capsaicin | Capsaicin | Depletes substance P from nerve endings, reducing pain signals over time [1.4.5]. | Nerve pain (neuropathy, postherpetic neuralgia), arthritis [1.5.4, 1.10.1]. | Capzasin, Zostrix [1.2.1]. |
Anesthetics | Lidocaine | Numbs the area by blocking local nerve signals [1.2.1]. | Minor cuts, burns, insect bites, nerve pain [1.11.1, 1.11.2]. | Aspercreme with Lidocaine, Salonpas Lidocaine Patch [1.2.1]. |
Safe and Effective Application
To maximize benefits and minimize risks, it's crucial to use analgesic ointments correctly [1.8.4].
- Read the Label: Always follow the product's directions carefully regarding dose and frequency [1.8.4]. For some products like Voltaren Gel, a dosing card is included to measure the correct amount [1.8.1].
- Apply to Clean, Intact Skin: Only apply the ointment to clean, dry skin that is free from cuts, wounds, rashes, or irritation [1.5.5, 1.8.4].
- Wash Hands: Wash your hands with soap and water before and after application to avoid spreading the product to your eyes, mouth, or other sensitive areas [1.8.1, 1.8.4]. Consider wearing gloves, especially when applying capsaicin [1.2.1].
- Avoid Heat and Bandages: Do not apply a heating pad over the treated area or wrap it with a tight bandage, as this can increase absorption and the risk of side effects like burns [1.8.3, 1.8.4].
- Be Patient: Some analgesics, particularly capsaicin and diclofenac, may take several days to a couple of weeks to provide significant relief [1.2.1, 1.10.1].
Conclusion
Analgesic ointments are a valuable tool for managing localized pain from a variety of muscle, joint, and nerve conditions [1.5.1, 1.5.4]. By understanding the different types available—from counterirritants that distract from pain to NSAIDs that fight inflammation—users can choose a product tailored to their specific needs. Their primary advantage lies in providing targeted relief with a lower risk of systemic side effects compared to oral painkillers [1.6.2]. For safe and effective use, it is essential to follow the application instructions and consult a healthcare professional if pain persists or worsens [1.8.3].
For more information on nonprescription medicines, you can visit the American Pharmacists Association (APhA).