Lisinopril, one of the most commonly prescribed blood pressure medications, causes side effects in a meaningful percentage of users. The most frequent issues are dizziness (affecting about 5–12% of patients depending on the condition being treated), headache (about 4–6%), and a persistent dry cough that’s unique to this class of drugs. Most side effects are mild and often improve within the first few weeks, but some require immediate medical attention.
The Most Common Side Effects
In clinical trials of patients taking lisinopril for high blood pressure, headache occurred in 5.7% of patients, dizziness in 5.4%, and fatigue in 2.5%. These numbers climb for people taking it for heart failure: dizziness jumped to nearly 12% at standard doses and almost 19% at higher doses. The pattern is straightforward. The more your blood pressure drops, the more likely you are to feel lightheaded or tired, especially in the first days of treatment.
Dizziness tends to be worst when you stand up quickly, particularly first thing in the morning. Your body needs time to adjust to operating at a lower blood pressure. For most people, this fades over the first week or two as the cardiovascular system recalibrates. Staying hydrated and rising slowly from sitting or lying positions helps during this adjustment period.
The Persistent Dry Cough
Lisinopril belongs to a class of drugs called ACE inhibitors, and all of them share a distinctive side effect: a dry, hacking cough with a tickling sensation in the throat. This isn’t a sign of illness. It happens because the drug blocks an enzyme that normally breaks down certain signaling molecules in your airways. When those molecules accumulate, they sensitize nerve endings in the throat and lungs, triggering the cough reflex and sometimes mild airway constriction.
In a large pooled analysis of over 27,000 patients on an ACE inhibitor, about 4% developed this cough, and roughly 3% stopped taking the medication because of it. The cough can start weeks or even months after beginning treatment, which is why many people don’t immediately connect it to their medication. The good news is that it typically disappears quickly after stopping the drug. If the cough becomes bothersome, your prescriber can switch you to a related class of blood pressure medication that doesn’t cause this problem.
Blood Pressure Dropping Too Low
Lisinopril is designed to lower blood pressure, but sometimes it works too well, particularly after the very first dose. This is most likely if you’re dehydrated, on a low-salt diet, taking water pills (diuretics), or being treated for heart failure rather than simple high blood pressure. Symptoms include feeling faint, lightheaded, or unusually weak.
The risk is highest in the first few hours after taking a new dose or after a dosage increase. If you feel like you might pass out, lying down with your legs elevated usually helps. This first-dose drop is typically the most dramatic. Subsequent doses rarely cause the same degree of blood pressure reduction because your body begins to compensate.
Rising Potassium Levels
Lisinopril changes how your kidneys handle potassium, causing your body to retain more of it than usual. A moderate rise is harmless, but if potassium climbs too high (a condition called hyperkalemia), it can cause muscle weakness, numbness, and in severe cases, dangerous heart rhythm disturbances.
The risk is highest for people who already have kidney problems, those taking potassium supplements, and people using certain other medications that also raise potassium (including some common diuretics). This is why routine blood work is standard when you’re on lisinopril. You don’t need to avoid potassium-rich foods like bananas or potatoes entirely, but dramatically increasing your intake of potassium supplements or salt substitutes (which are potassium-based) without your doctor’s knowledge is a real risk.
Effects on Kidney Function
This one is counterintuitive: lisinopril is often prescribed specifically to protect the kidneys in people with diabetes or chronic kidney disease, yet it can also temporarily stress them. When you start the drug, a mild bump in creatinine (a waste product your kidneys filter) is expected, roughly 15% above your baseline in the first two weeks, sometimes reaching 25% over the first month. In people with healthy kidneys, this shift is usually too small to notice on lab work.
For people who already have reduced kidney function, the picture is different. That initial creatinine rise can look alarming, but research shows that a moderate increase (under 30% above baseline) in the first two months actually predicts better long-term kidney outcomes. It’s a sign the drug is doing its job, reducing pressure inside the kidney’s delicate filtering units. The concern arises only when creatinine spikes more than 30% above baseline in those first two months, which signals that the drug may be cutting off too much blood flow to the kidneys.
Angioedema: Rare but Serious Swelling
The most dangerous side effect of lisinopril is angioedema, a sudden swelling of the face, lips, tongue, or throat that can obstruct breathing. It occurs in roughly 0.1% to 0.7% of people prescribed the drug. In a study tracking nearly 135,000 patients on ACE inhibitors over five years, 0.7% developed angioedema, with most cases appearing in the first year. About 0.07% experienced it within the first month alone.
Risk is not evenly distributed. Black patients developed angioedema at roughly three times the rate of other groups in that study (19.6% of angioedema cases vs. 5.9% of the overall patient population). Hispanic patients also showed elevated risk. Younger patients were affected more often than older ones. If you experience any swelling of your face, lips, or tongue while on lisinopril, this is a medical emergency regardless of how mild it seems initially, because the swelling can progress rapidly.
Anyone who has had angioedema from one ACE inhibitor should not take another. The reaction is tied to the drug class, not a specific brand.
Interactions With Common Pain Relievers
Over-the-counter painkillers like ibuprofen and naproxen (NSAIDs) are a significant concern for people on lisinopril. Both drug types affect blood flow through the kidneys by different mechanisms, and combining them can compound the strain. In one study, no kidney problems were found in patients taking either drug alone, but reversible kidney failure appeared in patients taking both together.
This interaction is sometimes called the “triple whammy” when a diuretic is added to the mix, as all three medications alter kidney blood flow in ways that stack up. If you take lisinopril regularly and need pain relief, acetaminophen (Tylenol) is generally a safer choice. Occasional NSAID use is not usually a crisis, but daily or frequent use alongside lisinopril creates meaningful risk, especially if you’re also on a diuretic or have any existing kidney issues.
Serious Risks During Pregnancy
Lisinopril carries a black box warning, the FDA’s strongest safety label, against use during the second and third trimesters of pregnancy. The drug can reduce the amniotic fluid surrounding the fetus, which in turn can lead to poor lung development, impaired growth, skull bone abnormalities, kidney malformation, and in the most severe cases, fetal death. Newborns exposed to ACE inhibitors late in pregnancy can also develop dangerously low blood pressure and kidney failure after birth, which has been fatal in some reported cases.
If you become pregnant while taking lisinopril, the priority is switching to a pregnancy-safe blood pressure medication as soon as possible. This is not a situation where you finish out your current prescription.