Missed a Dose of Lisinopril? Here's What to Do
This article is for informational purposes only and does not constitute medical advice. Always consult your doctor or pharmacist before making any changes to your medication routine.
If you missed a dose of lisinopril, take it as soon as you remember. If it's been more than 12 hours since your usual time, skip the missed dose and take tomorrow's dose on schedule. Never double up. Lisinopril is an ACE inhibitor taken once daily, and while missing a dose isn't as risky as with some other blood pressure medications, your coverage does fade after 12 hours. Call your pharmacist if you're unsure.
What happens when you skip a dose of lisinopril
Lisinopril has an effective half-life of about 12 hours. After you take your pill, it reaches peak effect around 6 hours, then gradually tapers. According to the FDA prescribing information, the blood pressure–lowering effect of lisinopril is substantially smaller at 24 hours compared to 6 hours after dosing. This trough-to-peak difference applies across doses, though some guidelines suggest that doses of 10 mg or less may show more noticeable end-of-interval weakening.
So if you miss a dose, you're not in immediate danger. Your blood pressure won't spike to crisis levels overnight. But by hour 18 to 24, the protection is noticeably thinner. If you regularly take lisinopril to keep your numbers under control, that gap matters.
Lisinopril is unlikely to cause rebound hypertension, though. Unlike beta-blockers such as metoprolol, where missing doses can trigger a rebound spike in heart rate and blood pressure above your original baseline, ACE inhibitors generally don't do that. Your blood pressure drifts back toward untreated levels rather than overshooting.
Can I take lisinopril late? The 12-hour guideline
Since lisinopril's strongest effects happen in the first 12 hours, the timing of a late dose matters. The 12-hour cutoff is a widely used general guideline from pharmacists and prescribing references, not an official FDA rule. Your doctor may adjust this based on your situation.
- Check how long ago you were supposed to take it. If you normally take lisinopril at 8 AM, count from there.
- Less than 12 hours late? Take it now. You'll still get useful blood pressure coverage, and your next dose tomorrow keeps you on track.
- More than 12 hours late? Skip the missed dose. Taking it too close to your next dose stacks the effects and could drop your blood pressure too low.
- Never take two doses at once. A double dose of lisinopril can cause dizziness, lightheadedness, or fainting from low blood pressure.
Forgot to take lisinopril? Scenarios by time of day
Say you normally take lisinopril at 8 AM. Here's what to do depending on when you realize you forgot:
| When you remember | Hours late | What to do |
|---|---|---|
| 10 AM | 2 hours | Take it now. Continue tomorrow at 8 AM. |
| 2 PM | 6 hours | Take it now. Continue tomorrow at 8 AM. |
| 7 PM | 11 hours | Take it now. You're still within the 12-hour window. |
| 10 PM | 14 hours | Skip it. Take tomorrow's dose at 8 AM. |
| Next morning | 24 hours | Skip yesterday's dose. Take today's dose at 8 AM. Don't double up. |
If you take lisinopril at bedtime, shift these times accordingly.
Your doctor or pharmacist may give you different guidance based on your dose, your condition, and your other medications, so treat this as a general framework.
The lisinopril cough: why some people skip doses on purpose
If you've been skipping lisinopril because it makes you cough, you're not alone. Roughly 5% to 20% of people on ACE inhibitors develop a dry, persistent cough. It's the single most common reason patients stop taking these medications.
The cough happens because lisinopril blocks an enzyme (ACE) that normally breaks down a substance called bradykinin. With more bradykinin hanging around in your lungs, the airway nerves get irritated. The result is a dry cough with no mucus, often worse at night or when lying down.
But skipping doses to manage the cough doesn't actually fix it, and it leaves your blood pressure uncontrolled on the days you skip. You lose on both fronts.
If the cough is driving you to miss doses, talk to your doctor. The usual fix is switching to an ARB (like losartan), which works on the same blood pressure pathway but doesn't cause bradykinin buildup. About two-thirds of people who cough on ACE inhibitors will cough again if they try a different ACE inhibitor, so switching within the same class rarely helps.
Skipped lisinopril dose vs. other blood pressure medications
Not all blood pressure medications handle missed doses the same way. Here's how lisinopril compares to two other common options:
| Medication | Class | Half-life | How fast BP rises after missing | Rebound risk |
|---|---|---|---|---|
| Amlodipine | Calcium channel blocker | 30–50 hours | Slowly — takes 2+ days | None |
| Lisinopril | ACE inhibitor | 12 hours | Moderate — effect diminishes over 24 hours | Minimal |
| Metoprolol tartrate | Beta-blocker | 3–4 hours | Quickly — can rebound within days of stopping | Significant |
Amlodipine is the most forgiving. Its long half-life means you have days of residual coverage. Metoprolol is the least forgiving, with a short half-life and real rebound risk if stopped abruptly.
Lisinopril is the middle ground. No significant rebound danger for most people, but its protection does diminish over the course of a day. Consistent daily dosing matters.
When to call your doctor
A single missed dose of lisinopril is usually fine. But contact your doctor or pharmacist if:
- You missed two or more days in a row. Multiple missed doses give your blood pressure time to climb back toward untreated levels. For more on this, see What Happens If You Stop Taking Blood Pressure Medication.
- You feel dizzy, have a severe headache, or notice vision changes after missing a dose. These could be signs of elevated blood pressure.
- You accidentally took two doses. Watch for lightheadedness, dizziness, or fainting. Stay hydrated, avoid standing up quickly, and call your doctor if symptoms are more than mild.
- You're skipping doses because of side effects like cough. Don't manage this on your own. Your doctor can switch you to a medication that works without the cough.
How to stop forgetting your lisinopril dose
Since lisinopril is once daily, it's easier to stay consistent with than twice-daily medications. But once-daily still means you need to remember every single day.
Put your lisinopril where you'll see it at the same time each day. Next to the coffee maker if you're a morning doser, on the nightstand if you take it at bedtime. The pill should be sitting there, visible, right when you'd normally take it.
If phone alarms aren't cutting it, Pillo uses persistent alarms that keep going until you acknowledge them. It also tracks your medication history, so on days when you can't remember whether you already took your pill, you can check instead of guessing. Not sure if you took today's dose? See our guide on what to do when you can't remember if you took your medication.
Track your refills too. Running out and going a few days without lisinopril is unlikely to cause a dangerous rebound for most people, but your blood pressure will creep back up. A week's buffer on refills keeps that from happening.
FAQ
What happens if you miss lisinopril for one day?
Your blood pressure protection fades over the course of 12 to 24 hours. Lisinopril has an effective half-life of about 12 hours, so its strongest effects wear off by the end of the day. One missed day is unlikely to cause a medical emergency, but your blood pressure will be higher than usual. Get back on schedule the next day and don't double up.
Can I take lisinopril a few hours late?
Yes. If you're only a few hours late, take it as soon as you remember. As a general guideline, if it's been less than 12 hours since your usual dose time, go ahead and take it. If more than 12 hours have passed, skip the missed dose and take your next one at the regular time.
Does lisinopril cause rebound hypertension if you stop?
ACE inhibitors like lisinopril are unlikely to cause rebound hypertension. When you stop taking lisinopril, your blood pressure generally returns gradually toward pre-treatment levels over several days rather than spiking above your original baseline. That said, you should never stop blood pressure medication without your doctor's guidance.
What if I accidentally took two lisinopril pills?
Contact your doctor or pharmacist. A double dose can drop your blood pressure lower than intended, causing dizziness, lightheadedness, or fainting. Stay hydrated, avoid sudden position changes, and seek medical attention if symptoms are severe or you feel faint.
Why does lisinopril make me cough?
Lisinopril blocks an enzyme (ACE) that breaks down bradykinin, a substance that can irritate airway nerves. With more bradykinin in your lungs, you develop a dry, persistent cough. This affects roughly 5% to 20% of ACE inhibitor users. If the cough is bothersome enough that you're considering skipping doses, talk to your doctor about switching to an ARB, which doesn't cause this side effect.
This article provides general information about lisinopril and is not a substitute for professional medical advice. Always consult your doctor or pharmacist before making changes to your medication schedule. If you experience symptoms like severe dizziness, chest pain, or fainting after missing a dose, seek medical attention immediately.
