Ivermectin has been discussed more widely, and more carelessly, than almost any other medicine. Here we separate what is established from what is not, and explain why any prescription for it should begin with a physician reviewing your full health picture.
This article covers ivermectin taken by mouth. Topical ivermectin also exists, but those are different products, each with its own approved uses. Everything here is general information. None of it is medical advice.
How ivermectin works
Chemically, ivermectin is one of the avermectins, a group of antiparasitic drugs. In many parasites it latches onto glutamate-gated chloride channels in nerve and muscle cells. The parasite becomes paralyzed, and the body then clears it. Our own cells lack these channels, which helps explain how the drug can affect a parasite while most patients tolerate it well.
Ivermectin entered human medicine in the 1980s, and the World Health Organization now includes it on its Model List of Essential Medicines.
The uses the FDA has approved
In the United States, the FDA has approved ivermectin tablets for two parasitic infections:
- Strongyloidiasis affecting the intestinal tract
- Onchocerciasis, the infection commonly called river blindness
The list is short, so it pays to state it exactly.
The same care applies to the dosage form, because both approvals cover tablets. Ivermectin prescribed through Teleways Rx is dispensed as a compounded capsule, and compounded drugs are not FDA-approved. The FDA does not verify the safety, effectiveness or quality of compounded drugs before they reach the market.
What “off-label” means
Once a medicine has FDA approval, physicians are legally allowed to prescribe it for conditions the FDA never evaluated it for. That practice is known as off-label prescribing. It happens throughout medicine and rests entirely on the prescribing physician’s discretion, and physicians sometimes use ivermectin this way for other parasitic infections when published evidence and their clinical judgment back it up.
The term carries a precise meaning too: when a use is off-label, the FDA has not reviewed the medicine for that particular purpose. A service you can trust will say clearly when that is the case.
What ivermectin is not for
The FDA has not approved ivermectin to prevent or treat any viral illness, COVID-19 included, and it is not prescribed through Teleways Rx for that purpose.
Nor is it a wellness supplement or something to take as prevention. Unless a parasitic infection has been diagnosed or is strongly suspected, there is no expected benefit from taking it, while its risks remain. Ivermectin made for animals can never stand in for a prescription written for a human patient.
Why a physician needs to review your case
Several features of ivermectin call for a decision made about you as an individual:
- The dose depends on your body weight, and the schedule differs widely from one condition to another.
- Food affects how much is absorbed, and the instructions change with the condition being treated, so go by your pharmacy label instead of general guidance.
- Other medicines can interact with it, and certain health conditions change how it should be taken.
- Testing is sometimes needed. Results from a stool test or blood work can change what a physician decides to prescribe.
Your physician also needs to hear about a current or planned pregnancy, breastfeeding, liver disease, or a weakened immune system before deciding.
Possible side effects
Dizziness, nausea, diarrhea, itching and rash are among the side effects people report. In someone carrying a heavy parasite load, a short-lived inflammatory reaction can happen while the parasites are being cleared. That response is expected and is different from an allergic reaction, but your care team should still hear about it.
Any side effect should be reported to your care team. MedWatch, the FDA’s reporting program, also takes reports straight from patients at 1-800-FDA-1088. For a severe reaction, such as difficulty breathing or swelling of the face, lips or throat, call 911 before anything else.
In brief
Ivermectin is a long-standing antiparasitic that requires a prescription, and as an oral tablet it has two FDA-approved uses. Every other question about it is a clinical one, best answered by a physician who knows your history, and that answer may be a different medicine or no medicine at all.
