If you accidentally took two losartan pills, stay calm. Losartan's maximum approved dose is 100 mg per day, and most people are prescribed 25 or 50 mg. If you doubled a 25 or 50 mg dose, you are at or below the maximum your doctor could prescribe. Monitor your blood pressure and watch for dizziness. Skip your next scheduled dose and resume your normal schedule after that.
Read on for the details.
Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Consult your doctor or pharmacist for advice specific to your medications.
Why a double dose of losartan is usually manageable
Losartan is an ARB (angiotensin II receptor blocker), not an ACE inhibitor like lisinopril. It lowers blood pressure by blocking a hormone that tightens blood vessels. The drug itself has a short half-life of about 2 hours, but its active metabolite (called E-3174) sticks around for 6 to 9 hours and does most of the heavy lifting.
The maximum approved dose for losartan is 100 mg per day. Clinical trials have tested doses up to 150 mg without unusual safety signals. So if your regular dose is 25 or 50 mg, a double dose puts you at 50 or 100 mg, which is within the range doctors prescribe every day.
That makes losartan more forgiving than many other blood pressure medications when it comes to accidental double dosing. Your main concern is a temporary drop in blood pressure.
What your double dose looks like
| Your prescribed dose | You accidentally took | Max approved daily | How it compares |
|---|---|---|---|
| 25 mg | 50 mg | 100 mg | Half the maximum |
| 50 mg | 100 mg | 100 mg | At the maximum |
| 100 mg | 200 mg | 100 mg | Double the maximum |
If your double dose is 50 mg or 100 mg, you are within the approved range. If you doubled a 100 mg dose to 200 mg, the FDA label notes that doses above 100 mg have not shown additional benefit. Clinical trials tested doses up to 150 mg, but the 150 mg dose provided no greater blood pressure lowering than 50 to 100 mg. At 200 mg, you are above studied ranges, so calling your doctor or pharmacist is the right move.
A note about losartan/HCTZ combo pills
Many people take losartan combined with hydrochlorothiazide (sold as Hyzaar). If you doubled a combo pill, you doubled two medications at once. The concerns are different because hydrochlorothiazide adds diuretic effects on top of losartan's blood pressure lowering. See our dedicated guide on accidentally doubling losartan/HCTZ for that situation.
What to do right now
- Stay calm. At typical prescribed doses, a single double dose of losartan is unlikely to cause serious problems.
- Check your blood pressure if you have a home monitor. Systolic (top number) below 90 mmHg with symptoms like dizziness or lightheadedness means you should call your doctor.
- Skip your next scheduled dose. Resume your regular schedule after that. The FDA label advises that if you miss a dose, take it as soon as you remember, but if it is close to your next dose, skip the missed one and resume your regular schedule.
- Avoid standing up too quickly. A blood pressure drop is more likely with the extra dose. Rise slowly from sitting or lying down.
- Stay hydrated. Drink water throughout the day.
- Avoid alcohol. Both alcohol and losartan lower blood pressure. Together, the effect is stronger.
- Write down the time and amount you took. This helps if you need to call your doctor or pharmacist later.
Symptoms to watch for
Mild symptoms (usually pass on their own)
These are common side effects of losartan that may be more noticeable after a double dose:
- Dizziness or lightheadedness
- Fatigue
- Mild headache
These typically resolve as the extra drug clears your system. Losartan's active metabolite has a half-life of 6 to 9 hours, so most of the excess should be out of your system within 18 to 24 hours.
Serious symptoms (call your doctor)
Contact your doctor or pharmacist if you experience:
- Significant dizziness or near-fainting when standing up
- Heart palpitations or irregular heartbeat
- Very low blood pressure (systolic below 90 mmHg) with symptoms
- Decreased urination or signs of kidney changes
Emergency symptoms (call 911)
Call 911 if you experience:
- Fainting or loss of consciousness
- Severe allergic reaction (swelling of face, lips, tongue, throat)
- Confusion or inability to stand
These would be very unusual from a single double dose at typical prescribed levels, but they require immediate attention.
When to call your doctor or Poison Control
For most people on 25 or 50 mg, a single accidental double dose does not require emergency intervention. Contact a professional if:
- You took more than one extra dose (three pills instead of one)
- You doubled a 100 mg dose (200 mg total, above the approved maximum)
- You doubled a losartan/HCTZ combo pill (two drugs doubled simultaneously)
- You take other blood pressure medications that could stack with losartan's effect
- You have kidney disease (losartan is processed partly through the kidneys)
- You notice any serious or emergency symptoms listed above
Contact numbers:
- Poison Control: 1-800-222-1222 (free, 24/7)
- Your pharmacist: Quick, accessible guidance based on your specific medication profile
- 911: For emergencies
How to prevent accidental double dosing
The most common scenario: you take your losartan, get distracted, and 20 minutes later you cannot remember whether you actually took it. A few approaches that solve this:
Track every dose with a medication reminder app
Regular phone alarms tell you when to take a pill, but they do not record whether you actually did. A dedicated tracking app logs every confirmed dose, so you always have a clear answer to "did I already take this?"
Pillo tracks every dose you confirm and uses persistent alarms that will not stop until you respond. If you are managing losartan alongside other medications, that kind of tracking prevents exactly this kind of mix-up.
Use a weekly pill organizer
A 7-day organizer gives you instant visual confirmation. Compartment empty? You took it. Compartment full? Take it now. Simple.
Take losartan at the same time every day
Consistency reduces confusion. If you are wondering about the best window for your dose, our guide on the best time to take losartan covers morning vs evening scheduling.
Build it into an existing habit
Pair your pill with something you already do, like breakfast or brushing your teeth. For more on this approach, see our medication routine guide.
Frequently asked questions
Is a double dose of losartan dangerous?
For most people on standard doses (25 or 50 mg), a single accidental double dose is not dangerous. At 50 mg total, you are at half the approved maximum. At 100 mg total, you are at the maximum dose doctors commonly prescribe. The main risk is a temporary drop in blood pressure causing dizziness. If you doubled a 100 mg dose to 200 mg, contact your doctor.
What should I do if I doubled my losartan/HCTZ combo pill?
Doubling a combo pill is more concerning because you have doubled two drugs at once. Losartan lowers blood pressure while hydrochlorothiazide increases urination and can affect your electrolytes. Read our full guide on accidentally doubling losartan/HCTZ for specific steps.
Should I skip my next dose of losartan after doubling up?
Yes. Skip the next scheduled dose, then resume your regular schedule. Do not stop taking losartan entirely. Sudden discontinuation of blood pressure medication can cause rebound blood pressure increases.
How long until the extra losartan wears off?
Losartan itself has a half-life of about 2 hours, but its active metabolite (E-3174) lasts 6 to 9 hours. Most of the extra dose's effects should resolve within 18 to 24 hours. Drink water and avoid standing up quickly during that time.
What if I am not sure whether I already took my losartan?
If you genuinely cannot remember, it is safer to skip that dose than to risk doubling up. One missed dose of losartan is unlikely to cause problems, while a double dose at higher prescribed levels can cause noticeable blood pressure drops. For more on this situation, see our guide on what to do when you can't remember if you took your medication.
Is losartan the same as lisinopril?
No. Losartan is an ARB (angiotensin receptor blocker) and lisinopril is an ACE inhibitor. They lower blood pressure through different mechanisms. If you doubled lisinopril instead, see our guide on accidentally doubling lisinopril.
Related guides
- Missed a dose of losartan? Here's what to do
- Best time to take losartan
- Accidentally doubled your blood pressure medication
- Accidentally took double dose of lisinopril
- What happens if you stop taking blood pressure medication
Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or pharmacist for advice specific to your medications. If you think you may have a medical emergency, call 911 or your local emergency number immediately.
Reviewed sources: FDA Losartan Label, Poison Control
