Lisinopril is not commonly associated with nightmares, but it can cause them in some people. Nightmares are not listed among the drug’s frequent side effects in clinical trials, and the overall reporting rate is low. However, case reports and post-marketing surveillance data confirm that some patients do develop nightmares after starting lisinopril, and the connection appears real for a small number of users.
What the Evidence Shows
Nightmares were not identified as a side effect during the original clinical trials for lisinopril. The FDA-approved label does list several post-marketing psychiatric effects, including mood changes, mental confusion, and hallucinations, but nightmares are not specifically named. That doesn’t mean they don’t happen. Post-marketing reports, which capture side effects after a drug reaches millions of real-world patients, tell a slightly different story.
The World Health Organization’s global adverse event database contains 87 reports of abnormal dreaming or nightmares linked to lisinopril. The Netherlands Pharmacovigilance Centre collected nine reports across all ACE inhibitors (the drug class lisinopril belongs to). When researchers analyzed these numbers statistically, the reporting rate for nightmares with lisinopril was not significantly higher than what you’d expect by chance alone. In other words, while individual cases are real, nightmares don’t appear to be a widespread problem with this medication.
One well-documented case, published in the journal Pharmacotherapy, involved a 63-year-old woman with no history of psychiatric illness, substance use, or alcohol problems who developed nightmares after starting lisinopril at 10 mg per day. Her doctors stopped the drug and later restarted it at a lower dose of 5 mg. The nightmares returned. Using a standardized scoring tool called the Naranjo scale, researchers rated the connection between her nightmares and lisinopril as “probable,” scoring a 6 out of a possible 13. The fact that the nightmares stopped when the drug was discontinued and came back when it was restarted is strong evidence of a direct link in her case.
How Lisinopril Compares to Other Blood Pressure Drugs
If you’re worried about nightmares from blood pressure medication, lisinopril is actually one of the less likely culprits. Beta-blockers, another common class of blood pressure drugs, are far more associated with sleep disturbances. A large analysis comparing antihypertensive medications found that beta-blockers were 1.68 times more likely to cause psychiatric side effects than lisinopril. Among the specific side effects tracked, beta-blockers carried significantly elevated risks of nightmares, drowsiness, and disorientation.
This comparison matters because nightmares are a well-known and well-documented effect of beta-blockers and certain older blood pressure drugs like alpha-agonists. With lisinopril, the association is far weaker and less consistent. If you switched to lisinopril from a beta-blocker and are still having nightmares, the timing may be coincidental, or it may take some time for the previous drug’s effects to fully clear.
Why It Might Happen
The exact mechanism behind lisinopril-related nightmares isn’t well understood. Lisinopril works by blocking an enzyme that narrows blood vessels, which lowers blood pressure. This enzyme (ACE) is present not only in the cardiovascular system but also in the brain, which means the drug has at least some potential to influence nervous system function. The FDA label acknowledges this indirectly by listing mood changes, confusion, and hallucinations as rare post-marketing psychiatric effects.
Animal research on a related ACE inhibitor, captopril, found that these drugs can affect the balance between the sympathetic nervous system (your “fight or flight” wiring) and the parasympathetic nervous system (the “rest and digest” side) during sleep. In that study, the ACE inhibitor actually improved sleep quality by restoring autonomic balance after a heart attack. This suggests ACE inhibitors do interact with sleep-regulating systems, though the direction of the effect may vary depending on a person’s underlying health.
What to Do if You’re Having Nightmares
If your nightmares started shortly after beginning lisinopril or after a dose increase, the timing alone is worth noting. In the published case report, the patient’s nightmares began after starting the drug and resolved when it was stopped. That pattern of onset and resolution is the strongest clue that a medication is responsible.
Before assuming lisinopril is the cause, consider other possibilities. Stress, poor sleep habits, other medications (especially sleep aids, antidepressants, or beta-blockers), alcohol, and even eating late at night can all trigger vivid dreams or nightmares. If you recently started multiple medications, isolating the cause becomes harder.
Stopping lisinopril on your own isn’t safe because sudden withdrawal can cause a rebound spike in blood pressure. If the nightmares are frequent or distressing enough to affect your sleep quality, your prescriber can evaluate whether a dose adjustment or a switch to a different blood pressure medication makes sense. Angiotensin receptor blockers (ARBs) work on a similar pathway and are a common alternative. Calcium channel blockers are another option with a different mechanism entirely.
The woman in the published case report ultimately chose to stay on lisinopril and tolerate her nightmares, which is also a valid choice if the drug is otherwise working well for your blood pressure. How disruptive the nightmares are to your daily life is the key factor in deciding whether a change is worth pursuing.