Ivermectin typically begins to work within a few hours to a few days, depending on the type and severity of the infection being treated. After oral administration, the drug is rapidly absorbed into the bloodstream, with peak blood levels usually reached within 4–5 hours. For many parasitic infections, patients may begin to notice relief of symptoms — such as reduced itching in scabies or fewer skin lesions — within 24 to 48 hours. However, the full effect of ivermectin iverheal may take several days to a week, especially in conditions like scabies or strongyloidiasis, where parasites need time to die and the body needs to recover. In the case of river blindness (onchocerciasis), improvement in symptoms may take even longer, and multiple doses over months may be needed for complete treatment.