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Active ingredient

Ivermectin

Ivermectin is an antiparasitic medicine used to treat certain infections caused by parasites. In its established medical uses it is prescribed for particular worm (helminth) infections, such as some intestinal worm infestations and river blindness (onchocerciasis), as well as some other parasitic conditions. Topical formulations are also used for certain skin conditions involving parasites, such as head lice and the inflammatory skin condition rosacea. It should be used only for its intended, approved purposes under medical guidance.

Reviewed by the Kam4eu Pharmacy Team on 21 June 2026 · Next review June 2027

Ivermectin medicines we deliver

Browse the full Antibiotics range

8 generic Ivermectin products — same molecule, different brands, formats and pack sizes.

How it works

Ivermectin acts on the nervous system and muscles of many parasites. It binds to particular channels in the parasite's nerve and muscle cells, increasing the flow of chloride ions. This causes paralysis and death of the parasite. These specific channels are found in invertebrates such as worms and certain external parasites, but are not present in the same way in humans, which is part of why the medicine can target parasites selectively when used appropriately.

How it is taken

Use ivermectin exactly as prescribed and follow the patient information leaflet. Oral forms are usually taken as directed, and your doctor will advise on timing and whether to take it with water on an empty stomach. Topical creams or lotions should be applied only to the affected area as instructed. Do not exceed the recommended use, and never use veterinary or unverified products intended for animals.

Side effects

Common (usually mild and temporary):

  • Itching or skin rash
  • Dizziness
  • Nausea
  • Headache
  • Muscle or joint aches
  • Mild swelling or tenderness of lymph nodes when treating certain infections

Stop and seek medical help if you experience:

  • Signs of a severe allergic reaction such as swelling of the face, lips, tongue or throat, difficulty breathing, or fainting — seek emergency care
  • Severe skin reactions, including widespread blistering or peeling rash
  • Severe dizziness, fainting, or a fast or irregular heartbeat
  • Confusion, drowsiness, seizures or other sudden changes in the nervous system
  • Severe or worsening eye symptoms, vision changes or eye pain

Safety & who should not take it

  • Use ivermectin only for the parasitic condition it has been prescribed for, and only under the guidance of a doctor; do not use it for unproven or off-label purposes.
  • Never use veterinary ivermectin products formulated for animals, as the strength and ingredients are not safe or suitable for people.
  • Tell your doctor about any other medical conditions, including liver problems, or if you have a weakened immune system.
  • Inform your doctor of all other medicines you take, including any that affect the nervous system.
  • If you are pregnant, planning a pregnancy or breastfeeding, discuss this with your doctor before use.
  • Some parasitic infections require follow-up checks or repeat treatment; attend any appointments your doctor arranges.
  • Keep the medicine out of the sight and reach of children, and return unused product to a pharmacy for safe disposal.

Storage

Store in the original packaging below 25°C unless the label states otherwise, away from heat, light and moisture, out of the sight and reach of children. Keep topical products tightly closed. Do not use after the expiry date.

Frequently asked questions

What is ivermectin used for?+

Its established uses are for certain parasitic infections, including some worm infestations and river blindness, and in topical form for conditions such as head lice and rosacea. It should be used only for these intended purposes under medical guidance.

Can I use the animal version of ivermectin?+

No. Veterinary products are formulated for animals and are not safe or appropriate for human use. Only use a product prescribed or supplied for you by a healthcare professional.

Might I need more than one dose?+

Some parasitic infections require repeat treatment or follow-up monitoring. Your doctor will advise whether and when a further dose is needed.

Important: This information is general and not a substitute for medical advice. Always read the patient information leaflet supplied with your medicine and consult a doctor or pharmacist before use — especially if you have existing health conditions or take other medication.

Ivermectin health guides

Ivermectin: Its Established, Approved Uses Explained

A factual guide to the recognised antiparasitic uses of ivermectin, covering worm infections, scabies, head lice, and rosacea.

Read guide

Ivermectin for Scabies: How This Treatment Works

An evidence-based look at ivermectin's established role in treating scabies and how it fits alongside topical options.

Read guide