Yes, metoprolol can cause erectile dysfunction, but the actual risk is lower than most people think. In clinical studies where patients didn’t know which medication they were taking, only about 8% reported new erectile problems. That number jumped to 32% when patients were told upfront that the drug might affect sexual function, revealing that anxiety and expectation play a surprisingly large role.
How Metoprolol Affects Erections
Metoprolol is a beta-blocker, meaning it works by blocking the sites where stress hormones (adrenaline and noradrenaline) normally bind. These same stress hormones are part of the chain of signals your body uses to produce and maintain an erection. By dampening that signaling system, metoprolol can interfere with two things that matter for erectile function: the nerve signals that help coordinate an erection, and the release of testosterone.
Unlike some newer beta-blockers, metoprolol does not boost nitric oxide, the molecule that relaxes blood vessels in the penis and allows blood to flow in. That’s a key distinction. It’s not that metoprolol actively constricts those blood vessels, but it doesn’t help keep them open either, and the overall dampening of the sympathetic nervous system can tip the balance toward difficulty getting or maintaining an erection.
The Numbers Are Smaller Than Expected
Two well-designed studies tested something unusual: whether simply knowing about a drug’s sexual side effects makes those side effects more likely to appear. The results were striking.
In one study of men starting metoprolol, researchers split participants into three groups. The first group was told the drug’s name and warned it could cause erectile dysfunction. The second group was told the drug’s name but not its sexual side effects. The third group wasn’t told anything about the medication. After 60 days, erectile dysfunction rates were 32% in the fully informed group, 13% in the partially informed group, and just 8% in the group that had no idea what they were taking.
A similar study using atenolol (a closely related beta-blocker) found nearly identical results: 31% when patients knew about the side effect, 16% when they knew only the drug name, and 3% when they were fully blinded. Researchers have called this the “Hawthorne effect” or nocebo effect, where the expectation of a problem actually helps create it. The anxiety triggered by worrying about sexual performance can itself impair erections, compounding whatever small pharmacological effect the drug has.
This doesn’t mean the drug has zero direct effect. That 3% to 8% rate in blinded patients is real. But the gap between 8% and 32% tells you that a large share of what gets blamed on metoprolol is driven by worry rather than chemistry.
Metoprolol vs. Newer Beta-Blockers
Not all beta-blockers carry the same risk. Nebivolol, a newer beta-blocker, has a built-in advantage: it stimulates the production of nitric oxide, the same molecule that ED medications like sildenafil target. Nitric oxide relaxes the smooth muscle tissue in the penis, which is essential for blood flow during an erection.
In a head-to-head clinical trial of men undergoing heart surgery, those given metoprolol saw their erectile function scores drop significantly, from an average of 15.2 to 12.9 on a standardized scale. Men given nebivolol showed no meaningful decline. Before treatment, 73% of men in the metoprolol group already had some degree of erectile difficulty. After treatment, that number climbed to 90%, while the nebivolol group remained stable. Both drugs were equally effective at preventing heart rhythm problems and other cardiac complications, meaning the difference in sexual function wasn’t a trade-off for weaker heart protection.
Carvedilol is another beta-blocker sometimes considered as an alternative, though its evidence for preserving sexual function is less robust than nebivolol’s. If erectile dysfunction is a concern, nebivolol is the beta-blocker with the strongest evidence for a neutral or even positive effect on erections.
Using ED Medications While on Metoprolol
Medications like sildenafil (Viagra) and tadalafil (Cialis) are generally considered safe to use alongside metoprolol, but there’s an important caveat. Both metoprolol and ED medications lower blood pressure, so combining them can cause dizziness, lightheadedness, or fainting, especially when you first start, after a dose change, or when standing up quickly.
This interaction is classified as moderate, not a hard contraindication. Many men use both safely. The bigger concern applies to men with serious heart conditions: if you’ve had a heart attack, stroke, or life-threatening heart rhythm problem in the past six months, or if your blood pressure is already very low, ED medications carry additional cardiac risk regardless of which blood pressure medication you’re on.
What You Can Do About It
If you’ve noticed erectile changes since starting metoprolol, the first thing worth recognizing is that anxiety about the side effect can be a self-fulfilling prophecy. That’s not dismissive; it’s supported by the clinical data. Knowing this can actually help break the cycle.
Beyond the psychological component, there are practical options. Switching to nebivolol is the most evidence-backed medication change, since it protects the heart equally well while actively supporting the nitric oxide pathway that erections depend on. Your prescriber can also evaluate whether a different class of blood pressure medication might work for your situation, since not every cardiac condition strictly requires a beta-blocker.
It’s also worth considering that the underlying condition being treated, whether it’s high blood pressure, heart failure, or coronary artery disease, independently increases the risk of erectile dysfunction. Poor cardiovascular health reduces blood flow everywhere, including the penis. In some cases, the disease itself is the bigger contributor, and the medication is absorbing blame it doesn’t fully deserve.
If metoprolol is the best medication for your heart but erections remain an issue, adding an ED medication is a reasonable path for many men. The blood pressure drop from the combination is manageable for most people, particularly if you start at a low dose and pay attention to how you feel when standing up.