Tadalafil and Metoprolol: Can They Be Taken Together?

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Key takeaways

• Tadalafil and metoprolol can usually be taken together if your prescriber approves and you start on a low dose
• Both medicines lower blood pressure, so monitor for dizziness or light-headedness, especially at first
• Never take tadalafil with nitrates, nicorandil, or riociguat—these combinations are dangerous
• Declare all blood pressure medicines during your online consultation for safe prescribing
• Do not stop or change your metoprolol dose without advice from your doctor

What is tadalafil and metoprolol used for?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction (ED) [4]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Tadalafil is available as on-demand tablets (10 mg or 20 mg, taken at least 30 minutes before sexual activity, with effects lasting up to 36 hours) or as a daily low-dose option (2.5 mg or 5 mg) [1][4]. It does not cause an erection on its own—sexual stimulation is still needed.

Metoprolol is a beta-blocker prescribed to manage high blood pressure (hypertension), angina (chest pain), heart rhythm problems, and to reduce the risk of further heart attacks after a previous event [3]. It works by slowing the heart rate and reducing the force of heart contractions, which lowers blood pressure and reduces the heart's workload. Metoprolol is usually taken once or twice daily, depending on the formulation and the condition being treated.

Both medicines affect the cardiovascular system, which is why understanding their interaction is important for safe use. Erectile dysfunction itself is often linked to cardiovascular health, and many men with high blood pressure or heart conditions take beta-blockers like metoprolol [1][10]. Fortunately, tadalafil can often be prescribed alongside metoprolol, provided your prescriber has reviewed your full medical history and current medications.

How do tadalafil and metoprolol interact?

Tadalafil and metoprolol can both lower blood pressure, so when taken together there is a potential additive effect [3][4]. This means your blood pressure may drop more than it would with either medicine alone, which can lead to symptoms such as dizziness, light-headedness, or fainting, particularly when standing up quickly. This interaction is not classified as a contraindication—unlike the dangerous combination of tadalafil with nitrates or nicorandil—but it does require careful monitoring and dose adjustment.

In plain terms, tadalafil relaxes blood vessels throughout the body (not just in the penis), which can cause a modest reduction in blood pressure. Metoprolol also lowers blood pressure by slowing the heart and reducing its force. When you take both medicines, the blood-pressure-lowering effects can add together. For most men, this is manageable and does not cause problems, especially if the metoprolol dose is stable and the tadalafil dose is started low.

The British National Formulary notes that PDE5 inhibitors like tadalafil should be used with caution in patients taking antihypertensive medicines, including beta-blockers [4]. Your prescriber will assess your current blood pressure control, the dose of metoprolol you are taking, and whether you have experienced any dizziness or low blood pressure symptoms. If tadalafil is appropriate, you will usually start on the lowest effective dose and be advised to monitor for any symptoms of low blood pressure, particularly after the first dose.

The mechanism in plain English

Think of your blood vessels as flexible tubes that can widen or narrow. Tadalafil causes these tubes to relax and widen, which improves blood flow to the penis but also slightly lowers the pressure throughout your circulatory system. Metoprolol, meanwhile, slows your heart's pumping action, which also reduces the pressure in those tubes. When both effects happen at once, the overall pressure can drop more than with either medicine alone. For most people, this drop is small and well tolerated, but it is why your prescriber needs to know about all your blood pressure medicines before prescribing tadalafil.

At a glance

What your prescriber checks before combining tadalafil and metoprolol

During an online consultation at Cured Pharmacy, the UK-registered prescriber will ask detailed questions about your cardiovascular health and current medications [2]. They will want to know the dose of metoprolol you are taking, how long you have been on it, and whether your blood pressure is well controlled. They will also ask about any symptoms of low blood pressure, such as dizziness when standing, fainting episodes, or feeling light-headed after taking your metoprolol.

The prescriber will review your full medication list to check for any other blood-pressure-lowering medicines (such as ACE inhibitors, angiotensin receptor blockers, calcium channel blockers, or diuretics) and to rule out absolute contraindications like nitrates, nicorandil, riociguat, or another PDE5 inhibitor [3][4]. They will also ask about your heart health: whether you have had a recent heart attack or stroke, unstable angina, severe heart failure, or very low blood pressure, as these conditions may mean sexual activity itself is inadvisable.

If you are stable on metoprolol and your blood pressure is controlled, the prescriber will usually recommend starting tadalafil at the lowest dose—typically 10 mg on-demand or 2.5 mg daily—and advise you to monitor for dizziness or light-headedness, especially after the first dose [4]. You should not stop or adjust your metoprolol dose without speaking to the doctor who prescribed it. The prescriber may also advise avoiding heavy alcohol and ensuring you are well hydrated, as both can add to the blood-pressure-lowering effect.

Practical advice for taking tadalafil with metoprolol

If your prescriber approves tadalafil, take it exactly as directed and do not exceed the recommended dose [4]. Start with the lowest dose and see how you respond before considering any increase. Take tadalafil on-demand at least 30 minutes before sexual activity (effects can last up to 36 hours), or take the daily low dose at the same time each day. Do not take tadalafil more than once in 24 hours, and never combine it with another PDE5 inhibitor such as sildenafil or vardenafil.

Be aware of the signs of low blood pressure: dizziness, light-headedness, blurred vision, or feeling faint, particularly when standing up quickly from sitting or lying down. If you experience these symptoms, sit or lie down until they pass, and mention them to your prescriber or GP at your next review. Avoid drinking large amounts of alcohol when taking tadalafil, as alcohol can worsen erectile dysfunction and add to the blood-pressure-lowering effect [1][4]. Grapefruit juice can raise tadalafil levels in your blood, so it is best avoided.

Continue taking your metoprolol as prescribed by your doctor—do not stop or change the dose without medical advice, even if you start tadalafil. If you develop chest pain during sexual activity, stop and seek urgent medical help. If you have an erection lasting more than four hours (priapism), or sudden loss of vision or hearing, go to A&E immediately [4]. These are rare but serious side effects that require prompt treatment. Always keep your GP informed about all the medicines you are taking, including those obtained through online consultations.

Monitoring and follow-up

After starting tadalafil, pay attention to how you feel, especially in the first few days. If you notice persistent dizziness, fainting, or any new symptoms, contact your GP or the prescribing service. Your GP may want to check your blood pressure at your next routine appointment to ensure it remains within a safe range. If your metoprolol dose is changed, or if any new blood pressure medicines are added, inform the prescriber before your next tadalafil supply so they can reassess the combination.

Can tadalafil and metoprolol be taken together safely?

Yes, tadalafil and metoprolol can usually be taken together, provided your prescriber has assessed your individual circumstances and you follow the recommended precautions [3][4]. Unlike the absolute contraindication with nitrates or nicorandil, the combination of tadalafil and a beta-blocker like metoprolol is not forbidden—it simply requires careful dose selection and monitoring for symptoms of low blood pressure.

The key is to ensure your blood pressure is stable on metoprolol before adding tadalafil, and to start tadalafil at the lowest effective dose. Most men tolerate the combination well, especially if they are already stable on their beta-blocker and have no history of severe low blood pressure or cardiovascular instability [2]. Your prescriber will take into account your age, other medical conditions, and any additional medicines you are taking.

If you have any concerns about taking tadalafil with metoprolol, discuss them openly during your online consultation. The prescriber can explain the risks and benefits in the context of your own health and may suggest alternative ED treatments if tadalafil is not suitable. Remember, erectile dysfunction can be an early warning sign of cardiovascular disease, so if you have not already done so, it is worth seeing your GP for a full health check [1][10]. Treating the underlying cause—such as better blood pressure control, stopping smoking, losing weight, or managing diabetes—can improve both your heart health and your erectile function.

Other blood pressure medicines and tadalafil

Metoprolol is just one of many blood pressure medicines, and the same principles apply to other antihypertensives. ACE inhibitors (such as ramipril or lisinopril), angiotensin receptor blockers (such as losartan or candesartan), calcium channel blockers (such as amlodipine), and diuretics (such as bendroflumethiazide) can all add to the blood-pressure-lowering effect of tadalafil [3][4]. This does not mean tadalafil is unsafe with these medicines, but it does mean your prescriber must know about every blood pressure tablet you take.

Alpha-blockers (such as doxazosin, tamsulosin, or alfuzosin, often used for prostate symptoms) carry a higher risk of low blood pressure when combined with PDE5 inhibitors, and extra caution is needed [3][4]. If you take an alpha-blocker, you should be stable on it before starting tadalafil, and the tadalafil dose will usually be lower. Your prescriber will give specific advice based on which alpha-blocker you use and the dose.

Never take tadalafil with nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites). These combinations can cause a dangerous, potentially life-threatening drop in blood pressure [3][4]. If you are prescribed a nitrate for angina, you must not use tadalafil or any other PDE5 inhibitor. Always declare every medicine, supplement, and recreational substance during your consultation—this information is confidential and essential for your safety.

When to seek further advice

If your GP changes your blood pressure medicines, adds a new one, or adjusts the dose of metoprolol, let the prescribing service know before ordering more tadalafil. If you develop new cardiovascular symptoms—such as chest pain, shortness of breath, or swelling of the ankles—see your GP promptly. Erectile dysfunction that is new or worsening can be a sign of underlying heart disease or diabetes, so a full medical review is important [1][2]. Your GP can arrange blood tests, check your blood pressure and cholesterol, and refer you to a specialist if needed.

When to get urgent help

• Chest pain during or after sexual activity—stop and call 999
• Erection lasting more than 4 hours (priapism)—go to A&E immediately
• Sudden loss of vision or hearing—seek urgent medical help
• Severe dizziness, fainting, or collapse—call 999
• New or worsening shortness of breath or swelling of ankles—see your GP the same day

Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.

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