If you are considering taking ivermectin and have concerns about your blood pressure, you are asking the right questions. This article explains what the research says about ivermectin and blood pressure, who needs to be cautious, and how to minimise any risk.
Can Ivermectin Affect Blood Pressure?
Yes, ivermectin can cause a drop in blood pressure (hypotension) in some people, though this is relatively uncommon at standard therapeutic doses. The effect is more likely to occur at higher doses or in people who already have low blood pressure or certain cardiovascular conditions.
The mechanism behind this is related to ivermectin’s action on GABA receptors. At therapeutic doses in humans, this effect is minor. However, at elevated doses, the mild vasodilatory effect of ivermectin can result in a noticeable drop in blood pressure.
Symptoms of Low Blood Pressure After Taking Ivermectin
If ivermectin does affect your blood pressure, you may experience:
- Dizziness or lightheadedness, especially when standing up quickly
- Feeling faint or weak
- Blurred vision
- Nausea
- Fatigue
These symptoms are generally mild and temporary. If you experience severe dizziness or feel faint after taking ivermectin, sit or lie down until the feeling passes and drink plenty of water.
Who Is Most at Risk?
The following groups have a higher chance of experiencing blood pressure changes after taking ivermectin:
- People already on blood pressure medication: Combining ivermectin with antihypertensive drugs could amplify blood pressure lowering effects.
- People with naturally low blood pressure: Those with baseline hypotension may be more sensitive to any further drop.
- Elderly patients: Blood pressure regulation is often less robust in older adults, making them more susceptible to medication-related changes.
- People taking high doses: Blood pressure effects are dose-dependent. Sticking to the recommended dose for your body weight significantly reduces the risk.
Does Ivermectin Raise Blood Pressure?
No. Ivermectin does not raise blood pressure. The concern is in the opposite direction – it may lower it slightly in some people. There is no clinical evidence that ivermectin causes hypertension (high blood pressure).
Ivermectin and Blood Pressure Medications
If you are currently taking medication to manage blood pressure, consult a healthcare provider before taking ivermectin. The combination is not necessarily dangerous, but monitoring is advisable to ensure your blood pressure does not drop to an uncomfortable level.
For a full overview of how ivermectin interacts with other medications, see our guide on ivermectin drug interactions.
How to Take Ivermectin Safely
To minimise the chance of blood pressure-related side effects:
- Take ivermectin at the correct dose for your body weight – do not exceed the recommended amount. See our dosage guide.
- Stay well hydrated before and after dosing
- Take it while sitting or lying down if you are prone to dizziness
- Avoid alcohol on the day of dosing
- Rest for a few hours after taking it
The Bigger Picture on Ivermectin Safety
For the vast majority of people taking ivermectin at therapeutic doses, blood pressure effects are not a meaningful concern. Ivermectin has been administered billions of times globally with a strong overall safety profile. For a comprehensive review, see our article on whether ivermectin is safe and our full breakdown of ivermectin side effects.
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