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Topical analgesic (counter-irritant, from chilli peppers)

Capsaicin: uses, side effects & precautions

Also known as Zostrix, Qutenza (patch), Axsain.

Queste informazioni hanno carattere puramente orientativo e non costituiscono un parere medico. Consulta sempre un professionista sanitario qualificato per problemi medici personali. In caso di emergenza, chiama il numero di emergenza locale.

What it is used for

  • Localised muscle and joint pain, including osteoarthritis
  • Nerve pain such as after shingles or in diabetic nerve damage (specialist patches)
  • Back and other persistent localised pain

How it works

Capsaicin, derived from chilli peppers, acts on pain-sensing nerve endings in the skin. With repeated use it reduces a chemical (substance P) the nerves use to signal pain, gradually easing localised and nerve-related pain.

How it is taken

Available as creams, gels and high-strength patches applied by a clinician. Apply it exactly as your doctor, pharmacist or the label directs, usually in a thin layer to the affected area. Wash your hands thoroughly after use, avoid the eyes and broken skin, and do not apply heat to treated areas. Regular use over days to weeks is often needed for benefit.

No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.

Common side effects

  • Burning, stinging or warmth at the application site, especially at first
  • Skin redness
  • Itching

Serious effects — get help

  • Severe or persistent burning, blistering or skin damage
  • Serious allergic reaction (swelling, rash, difficulty breathing)
  • Coughing or breathing irritation if accidentally inhaled
  • Severe eye irritation if it contacts the eyes

If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.

Interactions to watch

  • Other topical products applied to the same area
  • Heat sources or occlusive dressings, which can intensify the burning
  • Generally few whole-body drug interactions because little is absorbed

Who should take care

  • Apply only to intact skin and avoid eyes, mouth, nose and broken or irritated skin
  • Wash hands well after applying (or use gloves) to avoid spreading it to sensitive areas
  • Do not apply heat, tight bandages or take hot baths just after applying, as this worsens burning
  • Tell your pharmacist if you have very sensitive skin or an allergy to chilli
  • High-strength patches are applied only by healthcare professionals

Frequently asked questions

Why does capsaicin burn when I apply it?
The burning comes from its action on pain nerves and is usually strongest in the first few applications, easing as treatment continues. Persistent or severe burning should be reported.
How long until it helps?
It often needs regular use over several days to weeks before the full effect is felt. Do not expect immediate relief and keep applying as directed.
What if it gets in my eyes?
It causes intense stinging. Rinse with plenty of water and seek advice if irritation is severe. Wash hands carefully after every application to prevent this.
Can I use a heat pad over it?
Avoid heat, hot baths and tight dressings just after applying, as these intensify the burning sensation.
Is Capsaicin safe to take?
For most people it is safe when taken exactly as a doctor or pharmacist advises and as printed on the label. Tell your clinician about your other medicines and health conditions, and seek urgent care for any serious reaction.

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