Vardenafil and Tamsulosin: Can They Be Taken Together?

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What is vardenafil and how does it work?

Vardenafil (the generic form of Levitra) is a prescription medicine used to treat erectile dysfunction in men. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing more blood to flow in when you are sexually aroused [5]. Vardenafil does not cause an erection on its own—sexual stimulation is still needed.

The usual starting dose is 10 mg, taken about 25 to 60 minutes before sexual activity. Depending on how well it works and any side effects, your prescriber may adjust the dose to 5 mg or 20 mg. You should not take vardenafil more than once a day [5]. Common side effects include headache, flushing, nasal congestion, and indigestion.

Vardenafil is only available on prescription in the UK. At Cured Pharmacy, a UK-registered prescriber will review your online consultation to ensure vardenafil is safe and suitable for you, taking into account all your current medicines and health conditions.

What is tamsulosin and why is it prescribed?

Tamsulosin is an alpha-blocker medicine commonly prescribed to men with lower urinary tract symptoms caused by an enlarged prostate gland (benign prostatic hyperplasia, or BPH). It works by relaxing the muscles in the prostate and bladder neck, making it easier to pass urine. Tamsulosin does not shrink the prostate itself, but it can relieve symptoms such as difficulty starting urination, weak stream, and the need to urinate frequently or urgently.

The usual dose is 400 micrograms (0.4 mg) once daily, often taken after the same meal each day to keep levels steady. Tamsulosin can cause side effects such as dizziness, particularly when standing up quickly, because it lowers blood pressure. Other side effects may include abnormal ejaculation, headache, and drowsiness.

Because tamsulosin affects blood pressure, it is important to tell your prescriber if you are taking it when you request treatment for erectile dysfunction. The combination with vardenafil requires careful dose adjustment and monitoring.

When to get urgent help

• Severe dizziness, fainting, or feeling like you might pass out
• Chest pain or discomfort during or after sexual activity
• An erection lasting more than 4 hours (priapism)
• Sudden loss of vision in one or both eyes
• Sudden decrease or loss of hearing, possibly with ringing in the ears

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

How do vardenafil and tamsulosin interact?

Vardenafil and tamsulosin can interact because both medicines lower blood pressure, although they do so through different mechanisms. Tamsulosin relaxes smooth muscle in the prostate and blood vessels, while vardenafil relaxes blood vessels in the penis and can also have a mild effect on overall blood pressure. When taken together, the blood-pressure-lowering effects can add up, increasing the risk of dizziness, light-headedness, or fainting, especially when standing up quickly (a condition called postural or orthostatic hypotension) [5].

This interaction does not mean the two medicines cannot be used together—many men take both safely—but it does require careful prescribing. Your doctor or prescriber will usually ensure you are stable on tamsulosin (you have been taking it for a while without problems) before starting vardenafil at the lowest effective dose. This approach minimises the risk of a sudden drop in blood pressure.

It is essential to be honest during your consultation about all the medicines you take, including over-the-counter products and supplements. Your prescriber will review the combination and decide whether vardenafil is suitable, or whether a different PDE5 inhibitor might be a better choice for you.

Why the interaction matters

The main concern with combining vardenafil and tamsulosin is the risk of symptomatic low blood pressure. Symptoms can include dizziness, light-headedness, blurred vision, weakness, or fainting, particularly when you stand up from sitting or lying down. In rare cases, a fall in blood pressure can lead to a fall and injury. This is why your prescriber will start you on the lowest dose of vardenafil (usually 5 mg) if you are already taking tamsulosin, and will advise you to watch for warning signs [5].

What your prescriber will check before combining vardenafil and tamsulosin

When you request vardenafil through an online consultation at Cured Pharmacy, a UK-registered prescriber will review your medical history and current medicines carefully. If you are taking tamsulosin, the prescriber will check that you have been on a stable dose for some time and that you are not experiencing troublesome side effects such as dizziness or fainting. They will also ask about your blood pressure and any history of heart or circulation problems.

The prescriber will usually recommend starting vardenafil at the lowest dose (5 mg) to reduce the risk of an interaction. They may also advise taking the two medicines at different times of day if possible, although this is not always necessary. You should never adjust the dose of either medicine yourself—always follow the prescriber's instructions.

If you are taking other medicines that lower blood pressure (such as other antihypertensives), or medicines that affect how vardenafil is broken down in the body (such as certain antibiotics or antifungals), the prescriber will take these into account as well. The goal is to ensure the combination is as safe as possible for you.

Other alpha-blockers and vardenafil

Tamsulosin is not the only alpha-blocker. Others include doxazosin, alfuzosin, terazosin, prazosin, silodosin, and indoramin. All of these medicines can interact with vardenafil in a similar way, because they all lower blood pressure. If you take any alpha-blocker, you must declare it during your consultation. The same precautions apply: you should be stable on the alpha-blocker, and vardenafil will usually be started at the lowest dose [5].

Practical advice for taking vardenafil and tamsulosin together

If your prescriber approves the combination of vardenafil and tamsulosin, there are several practical steps you can take to use both medicines safely. First, always take each medicine exactly as prescribed—do not take more vardenafil than recommended, and do not skip or double up doses of tamsulosin. Take tamsulosin at the same time each day, ideally after the same meal, to keep blood levels steady.

Be cautious when standing up, especially in the first few hours after taking vardenafil. Sit on the edge of the bed or chair for a moment before standing, and rise slowly. Avoid sudden changes in posture. If you feel dizzy or light-headed, sit or lie down immediately until the feeling passes. Avoid heavy alcohol, as it can make dizziness worse and may also interfere with your ability to get an erection.

If you experience severe dizziness, fainting, chest pain, or an erection lasting more than four hours, seek medical help immediately. These are rare but serious side effects. For less urgent concerns—such as mild dizziness that does not improve, or questions about your dose—contact your GP or the prescribing service. Do not stop taking tamsulosin suddenly without medical advice, as this can worsen urinary symptoms.

Alternatives to vardenafil if you take tamsulosin

Vardenafil is not the only option for treating erectile dysfunction, and your prescriber may suggest an alternative PDE5 inhibitor if they feel it would be safer or more suitable for you. Sildenafil (generic Viagra) and tadalafil (generic Cialis) are also PDE5 inhibitors and carry a similar risk of interaction with tamsulosin, so the same precautions apply: you should be stable on the alpha-blocker and start on a low dose of the ED medicine [3][4].

Tadalafil is sometimes preferred because it can be taken as a low daily dose (2.5 mg or 5 mg), which may produce more stable blood levels and reduce the risk of sudden blood pressure changes. Avanafil (Spedra) is another PDE5 inhibitor that works quickly and may be an option, though the same interaction applies [6]. Your prescriber will discuss the options with you based on your individual circumstances.

If PDE5 inhibitors are not suitable, other treatments for erectile dysfunction include alprostadil (a prescription medicine available as a cream applied to the tip of the penis, or as an injection) and vacuum erection devices. Your GP or a specialist can advise on these alternatives [2]. At Cured Pharmacy, our prescribers can help you find the most appropriate treatment after a thorough consultation.

When to see your GP

If you have new or worsening erectile dysfunction, it is important to see your GP for a full assessment. ED can be an early warning sign of cardiovascular disease or diabetes, and treating the underlying cause may improve your symptoms [1][2]. Your GP can also review all your medicines, including tamsulosin, and refer you to a specialist if needed. Online prescribing services like Cured Pharmacy are convenient for ongoing treatment, but they complement—rather than replace—care from your GP.

In summary

• Vardenafil and tamsulosin can be taken together, but only under medical supervision.
• Both medicines lower blood pressure, increasing the risk of dizziness or fainting.
• You must be stable on tamsulosin before starting vardenafil at the lowest dose.
• Always declare all your medicines during your consultation for a safe prescription.
• Stand up slowly and seek help if you experience severe dizziness or fainting.

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