Does Losartan Cause Tinnitus? Examining the Evidence

Losartan does not appear to cause tinnitus based on available clinical and pharmacovigilance evidence. In fact, research points in the opposite direction: the drug may have properties that protect the inner ear and even suppress some of the brain changes thought to underlie tinnitus. What often confuses people is that high blood pressure itself is linked to tinnitus, and losartan is frequently prescribed alongside other medications that carry a stronger association with ringing in the ears. Untangling the drug from the condition it treats, and from the pills taken alongside it, is where the real story lies.

What Adverse Event Databases Show About Losartan and Tinnitus

One of the most straightforward ways to check whether a drug causes a particular side effect is to look at large pharmacovigilance databases, which collect reports from patients and clinicians worldwide. The FDA’s Adverse Event Reporting System (FAERS) is the biggest of these. A 2024 analysis of FAERS data identified the top 25 drugs most strongly associated with tinnitus reports. Losartan did not make the list. The drugs that did included duloxetine (an antidepressant), ciprofloxacin (an antibiotic), and adalimumab (an immunosuppressant), all with far more reports and stronger statistical signals than any blood pressure medication in the angiotensin receptor blocker (ARB) class.¹

This does not prove losartan never triggers tinnitus in anyone. FAERS is a voluntary reporting system, so it underestimates the real rate of any side effect. But the absence of losartan from a ranked list of top tinnitus-associated drugs is meaningful: if the drug were a common culprit, it would show up in a database of this size. Losartan is one of the most widely prescribed medications in the world, so there is no shortage of patients who could have filed reports.

How ARBs Compare to Other Blood Pressure Drugs

A prospective study that tracked tinnitus across different classes of antihypertensive medications found that patients on ARBs (the class that includes losartan) had a tinnitus incidence of about 14%, while patients on diuretics had a rate closer to 27%. Alpha-blockers fell in between at roughly 22%.² That difference was statistically significant, meaning ARBs were associated with less tinnitus than diuretics, not more.

A separate cross-sectional study confirmed the pattern from a different angle. It found that certain drug classes were positively associated with tinnitus in hypertensive patients, including ACE inhibitors, thiazide diuretics, potassium-sparing diuretics, and calcium channel blockers. ARBs were not among the classes showing a positive association.³ These two studies, taken together, suggest that if you are on a blood pressure medication and develop tinnitus, the medication most worth investigating is usually not your losartan. It may be the diuretic or calcium channel blocker you take alongside it.

The Hydrochlorothiazide Confusion

This is probably the single biggest source of confusion. Losartan is very commonly prescribed as a combination pill with hydrochlorothiazide (HCTZ), a thiazide diuretic. The combination is sold under brand names like Hyzaar. When patients take this combination pill and develop tinnitus, they may attribute the symptom to losartan when the more likely contributor is the HCTZ component.

A case series examining hydrochlorothiazide specifically flagged hearing disorders as an underappreciated adverse effect, and recommended that healthcare professionals be cautious about prescribing ototoxic drugs alongside HCTZ.⁴ Diuretics in general can alter the fluid balance in the inner ear, and the data consistently show them at the higher end of tinnitus incidence among blood pressure drugs. If you are taking a losartan-HCTZ combination and experiencing ringing in your ears, the HCTZ half of the pill deserves more scrutiny than the losartan half. That is a conversation worth having with your prescriber, because in many cases it is possible to switch to losartan alone or to pair it with a different class of diuretic.

Hypertension Itself Is Linked to Tinnitus

The other major complication is that high blood pressure, the very condition losartan treats, is associated with tinnitus independently of any medication. A meta-analysis pooling data from multiple studies found that people with hypertension were about 37% more likely to have tinnitus than people without it.⁵ The relationship is not perfectly clean: a systematic review found that studies looking at tinnitus patients tended to find high rates of hypertension, while studies starting with hypertensive patients did not always find elevated tinnitus rates. Still, the overall evidence supports some degree of association, even if a direct cause-and-effect link remains uncertain.⁶

The practical implication is that someone who starts losartan and then develops tinnitus may be experiencing a symptom of their hypertension rather than a side effect of the drug. The timing creates an illusion of causation: the drug starts, the symptom appears, and the brain draws a straight line between the two. But if uncontrolled blood pressure was already quietly affecting the delicate blood vessels of the inner ear, the tinnitus may have been brewing before the prescription was ever filled. In some cases, bringing blood pressure under control could actually improve tinnitus over time rather than cause it.

Evidence That Losartan May Protect Against Tinnitus

Perhaps the most surprising part of this story is that researchers are actively studying losartan as a potential treatment for hearing loss and tinnitus, not as a cause. A 2025 review examined the evidence for repurposing renin-angiotensin system drugs, specifically ARBs, to treat inner ear disorders including hearing loss, tinnitus, and vertigo. The review found proposed otoprotective mechanisms that support this idea.⁷

The reasoning comes down to how losartan works at a molecular level. When you lose hearing, the balance of inputs arriving at a part of the brainstem called the cochlear nucleus gets disrupted. The brain tries to compensate by growing new nerve connections, a process called axonal sprouting. But this compensatory rewiring can go wrong, creating phantom signals that the brain interprets as sound. That maladaptive rewiring is thought to be one mechanism behind tinnitus. The sprouting process is driven by a signaling pathway involving a molecule called TGF-β, and losartan happens to suppress that pathway. An animal study tested this directly and found that losartan-treated animals had significantly less of this abnormal rewiring after hearing loss compared to untreated animals.⁸

Separately, research in animal models of a type of tumor called vestibular schwannoma (which grows on the nerve connecting the inner ear to the brain) found that losartan treatment normalized the tumor’s inflammatory environment and prevented tumor-induced hearing loss. A retrospective look at human patients with these tumors who happened to be on ARBs for blood pressure showed no progression in hearing loss, compared to patients on other antihypertensives or no blood pressure medication at all.⁹ This is early-stage research and should not be taken as proof that losartan treats tinnitus in everyday patients, but it does reinforce a pattern: the available evidence leans toward losartan being protective to the auditory system rather than harmful.

Why Losartan Still Appears on Some Side Effect Lists

If you look up losartan’s prescribing information or scan a drug reference website, you will often see tinnitus listed as a rare or infrequent side effect. This does not necessarily mean the drug causes it. Drug side effect labels are built from clinical trial data where any symptom that occurs during the trial period gets recorded, whether or not there is evidence that the drug caused it. In a large trial of thousands of hypertensive patients followed over months, some will develop tinnitus simply because tinnitus is common in that population. The question is whether it happens more often in the drug group than in the placebo group, and for losartan, the data do not show a meaningful difference.

Regulatory agencies tend to err on the side of listing a symptom if it was reported during trials, even when the rate was similar to placebo. This is sensible from a safety perspective but creates the misleading impression that every listed side effect is something the drug actually causes. For losartan specifically, tinnitus appears in lists alongside dozens of other low-frequency events. The pharmacovigilance data, the comparative studies, and the mechanistic research all point away from a causal relationship.

What to Do If You Develop Tinnitus While Taking Losartan

If you notice ringing, buzzing, or hissing in your ears after starting losartan, the worst thing to do is stop the medication abruptly without medical guidance. Blood pressure drugs should generally be tapered rather than stopped cold, and the tinnitus is more likely related to your blood pressure itself, a co-prescribed medication, or another cause entirely.

A practical approach involves a few steps. First, check whether you are taking a combination pill that includes HCTZ. If so, ask your doctor whether switching to losartan alone or to a different combination might help. Second, consider whether the tinnitus actually started before the medication. Many people only notice tinnitus when they start paying attention to their bodies, which frequently happens when a new prescription prompts health anxiety. Third, review all your medications. NSAIDs like ibuprofen, certain antibiotics, loop diuretics, and some antidepressants are all more strongly linked to tinnitus than losartan is. A medication audit can sometimes identify a more likely culprit.

If the tinnitus is genuinely new and bothersome, your doctor can experiment with substituting losartan for another ARB (like valsartan or irbesartan) to see if there is an idiosyncratic individual reaction, although this would be unusual. The broader class of ARBs shares the same general safety profile regarding hearing, so switching within the class is more about ruling out a rare individual sensitivity than about escaping a known class effect.

Drugs That Actually Are Strongly Linked to Tinnitus

It helps to put losartan’s tinnitus profile in context by knowing which drugs do carry a strong signal. The FAERS analysis mentioned earlier identified duloxetine and ciprofloxacin as two of the drugs with the highest reporting rates and strongest statistical associations.¹ Beyond those, well-established ototoxic drug categories include aminoglycoside antibiotics (like gentamicin), loop diuretics (like furosemide), platinum-based chemotherapy agents (like cisplatin), high-dose aspirin, and quinine. These drugs have decades of clinical evidence and clear mechanistic pathways explaining their effects on hearing.

Losartan does not belong in this company. Its mechanism of action, its pharmacovigilance profile, and its head-to-head comparisons with other antihypertensive classes all suggest it sits at the low-risk end of the spectrum for auditory side effects. If anything, the emerging research into its potential to protect the inner ear and suppress the type of neural rewiring that contributes to tinnitus puts it in a genuinely unusual position for a blood pressure drug: a medication that may one day be repurposed to treat the very symptom patients worry it causes.

When the Timing Feels Too Suspicious to Ignore

Human beings are pattern-recognition machines, and when a symptom starts shortly after a new medication, the conclusion feels obvious. But tinnitus has an enormous number of potential triggers beyond medication. Noise exposure, earwax buildup, jaw tension, caffeine intake changes, sleep deprivation, and stress can all initiate or worsen tinnitus. Age-related hearing loss, which affects a large proportion of the same population taking blood pressure medication, is another major contributor. One study found that hypertension prevalence among tinnitus patients was about 44%, compared to about 31% in those without tinnitus.³ That overlap means many people discovering tinnitus for the first time will also be starting a blood pressure drug around the same stage of life, purely by coincidence.

The fact that losartan prescriptions and tinnitus onset cluster in the same age group is probably the single biggest reason the question “does losartan cause tinnitus?” gets asked so often. The answer, based on current evidence, is that it almost certainly does not in the vast majority of cases. The more productive questions are whether your blood pressure is well controlled, whether you are taking a diuretic alongside it, and whether other common triggers might explain the ringing. Those conversations tend to lead somewhere useful.