ivermectin (Stromectol)

Medically Reviewed on 8/25/2021

What is ivermectin, and how does it work (mechanism of action)?

Ivermectin is an anti-parasitic medication. Ivermectin works by binding to invertebrate muscle and nerve cells of parasites, causing paralysis and death of parasites. Ivermectin is active against the non-adult form of Onchocerca volvulus. Ivermectin is also active against the intestinal activity of Strongyloides stercoralis. The FDA approved ivermectin in November 1996.

What brand names are available for ivermectin?

  • Stromectol

Is ivermectin available as a generic drug?


Do I need a prescription for ivermectin?


What are the uses for ivermectin?

  • Ivermectin is used for intestinal infection caused by Strongyloides stercoralis.
  • Ivermectin is also used for infections caused by a non-adult form of Onchocerca volvulus.
  • Off-label use includes treatments for head lice, blepharitis, and filariasis.

What are the side effects of ivermectin?

Common side effects of ivermectin are:

Other side effects include:


Bowel regularity means a bowel movement every day. See Answer

What is the dosage for ivermectin?

Dosing is complicated and varies for each disease.

  • Dosing begins with 15 kg weight and varies with weight ranges up to 80 or 85 kg depending on the disease process and based on about 200 mcg ivermectin per kg body weight.

Intestinal strongyloidiasis:

  • If weighing more than 85 kg take 200 mcg/kg of ivermectin by mouth as a single dose. If evidence of larvae is still presented during 3 months following therapy, re-treat with a single dose.


  • If weighing more than 85 kg take 150 mcg/kg of ivermectin by mouth as a single dose. Consider retreatment between 3 to 12 months.

Safe and effective use of ivermectin is not established for patients weighing less than 15 kg.

Which drugs or supplements interact with ivermectin?

Ivermectin should be used with caution with warfarin (Coumadin) because ivermectin can increase risks of bleeding and bruising when co-administered with warfarin.

Is ivermectin safe to take if I'm pregnant or breastfeeding?

There are no adequate studies done on ivermectin to determine safe and effective use in pregnant women. Ivermectin should be avoided in pregnant mothers to avoid any risk to the unborn.

Ivermectin enters breast milk in trace amounts. Therefore, it should be avoided in nursing mothers to prevent any adverse effects to the newborn.

What else should I know about ivermectin?

What preparations of ivermectin are available?

Tablets: 3 mg

How should I keep ivermectin stored?

Store ivermectin tablets at temperatures below 30 C (86 F).


Ivermectin (Stromectol) is a medication prescribed to treat infections caused by Strongyloides stercoralis and for infections caused by the adult form of Onchocerca volvulus. Side effects, drug interactions, dosage, storage, and pregnancy safety information should be reviewed prior to using this medication.

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Medically Reviewed on 8/25/2021
Medically reviewed by John P. Cunha, DO, FACOEP; Board Certified Emergency Medicine


FDA Prescribing Information.