Can Ivermectin Cause Constipation or Dizziness? Are They Common

Can Ivermectin Cause Constipation or Dizziness? Are They Common
Published : Jul 05, 2025

Yes, Ivermectin can cause side effects like Dizziness or, less commonly, constipation.

Dizziness is more frequently reported due to its effect on the nervous system, especially when standing up quickly.

While constipation is rare, it is possible, especially in individuals with sensitive digestive systems.

Ivermectin is widely used to treat parasitic infections, but like all medications, it may cause side effects in some users.

If you're facing Dizziness or constipation while taking Ivermectin, you need to understand the causes of these symptoms.

Understanding why this happens can help you find out how to manage the adverse effects of Ivermectin.

Let's explore these effects in detail and when to consult your doctor.

What is Ivermectin?

Ivermectin is a medicine that's mainly used to treat parasitic infections in humans.

Doctors often prescribe it for conditions like scabies, lice, and intestinal worms.

It works by paralysing and killing the parasites so your body can get rid of them.

It's been around for decades and is generally safe when taken the right way with a proper diagnosis.

Like most medicines, Ivermectin can come with some side effects, and not every user faces them.

The good news is that most of them are mild and temporary, which fade as the body adjusts to the medicine.

But some side effects, like Dizziness and constipation, can surprise you, especially if no one told you about them in advance.

Explore the 5 common side effects of Ivermectin.

Can Ivermectin Cause Constipation?

Yes, Ivermectin can cause constipation, but not for everyone.

Constipation isn't the most common side effect, but some people do report it after taking Ivermectin.

Why? Well, when Ivermectin starts doing its job and killing parasites, your body begins to flush them out.

That process can mess with your digestive system, causing issues like constipation.

You might feel bloated, gassy, or even have trouble going to the bathroom.

In some cases, people experience slower digestion, especially if they aren't eating enough fibre or drinking enough water during treatment.

If your stomach already tends to be sensitive, the chances of feeling constipated are higher.

What can help ease constipation induced by Ivermectin?

You can follow these ways to help you prevent constipation, such as side effects during the use of Ivermectin:

  • Drink more water throughout the day.
  • Eat more fibre-rich foods like fruits, vegetables, and oats.
  • Try gentle movement like walking after your meals.
  • Avoid greasy or heavy meals right after taking your dose of Ivermectin.

Usually, the constipation goes away in a day or two.

But in case it persists or becomes painful, it would be best to consult a doctor.

Clear the Infection, Regain Control – Ivermectin Tablets for Scabies, Lice & More.

 

What About Dizziness due to Ivermectin?

Yes, Dizziness can also happen with the use of Ivermectin, although again, it's not super common.

Some people feel a bit lightheaded or unsteady after taking the medicine.

It might hit a few minutes or hours after swallowing your Ivermectin dose.

For most, it's a mild feeling, but for others, especially those who are dehydrated or sensitive to Ivermectin, this effect is stronger.

So why does this happen?

Ivermectin may slightly lower your blood pressure, and that can make you feel dizzy or weak.

It might also cause drowsiness in some cases.

And if you're already taking medicines that affect your nervous system or blood pressure, the effects might feel stronger.

How to deal with Dizziness caused by Ivermectin?

Follow these safety measures if you feel dizzy after using Ivermectin tablets:

  • Sit or lie down after taking the medicine.
  • Don't drive or operate machinery until you know how it affects you or you start to feel dizzy.
  • Avoid taking the Ivermectin tablet on an empty stomach or without fluids.
  • Stay well-hydrated, especially during the treatment.

If the Dizziness doesn't go away or gets worse, inform your doctor and seek medical help if needed.

Before starting treatment, make sure you're informed—read our Ivermectin Safety Guide for essential safety tips and usage guidelines.

When Should You Be Concerned About These Side Effects of Ivermectin?

Most side effects of Ivermectin are mild, like constipation or Dizziness, which go away within a day or two.

But there are some red flags you shouldn't ignore.

If you notice any of the following symptoms, call a doctor right away:

  • Swelling of your face, lips, or throat
  • Rash, itching, or hives
  • Trouble breathing
  • Fainting or confusion
  • Blurry vision
  • Severe stomach cramps or chest pain

These could be signs of an allergic reaction or something more serious, so be alert to these during treatment.

Also, compare: Ivermectin vs. Albendazole: Know the Key Differences and Uses

Did You Know?

Ivermectin was originally developed for veterinary use and was only later found effective for humans. Its discovery had such a massive global health impact that the scientists behind it received the 2015 Nobel Prize in Physiology or Medicine for fighting parasitic diseases.

Final Thoughts

Ivermectin is a well-known and widely used medicine, and for good reason.

It works effectively for many parasitic infections and is usually easy to tolerate.

But it's important to know what side effects might show up during the use of any medicine, even if they're rare.

If you're experiencing constipation or Dizziness while taking Ivermectin, you're not alone.

Most of the time, it's nothing serious and will pass on its own.

Just listen to your body, stay hydrated, and talk to a doctor if anything feels off.

Thinking of buying Ivermectin online? Just make sure you're getting it from a reliable and trusted source, especially if you're based in the U.S.

You can visit Refillonlinepharmacy, a one-stop platform to shop top generic medicines online at the best price.

Faq

Yes, Constipation is a less common side effect of Ivermectin. If it becomes persistent or severe, consult your doctor for proper guidance to prevent and manage it.
 

Dizziness may occur, especially during the first few doses of Ivermectin. It's usually temporary, but track your symptoms closely and avoid driving if you feel lightheaded.
 

Dizziness usually goes away within a few hours to a day after the use of Ivermectin. If it continues or worsens, contact your doctor immediately. However, not everyone using Ivermectin faces this symptom.
 

Do not stop the medicine without your doctor's advice. Talk to your doctor first if side effects become bothersome or affect your daily life.
 

Drink plenty of water, eat fibre-rich foods, and stay active to manage this effect of Ivermectin. If Constipation persists, ask your doctor about using a mild laxative.