Can You Take Tadalafil and Perindopril Together?

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At a glance

What Is Tadalafil and How Does It Work?

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. Unlike some ED medicines, tadalafil has a long duration of action—up to 36 hours—which is why it's sometimes called the 'weekend pill' [1].

Tadalafil is available in two dosing schedules: on-demand tablets (10mg or 20mg taken at least 30 minutes before sexual activity) and daily low-dose tablets (2.5mg or 5mg taken once a day) [4]. Both require sexual stimulation to work; tadalafil does not cause an automatic erection. It is available as generic tadalafil or under the brand name Cialis, and all formulations require a prescription following a clinical assessment by a UK-registered prescriber.

What Is Perindopril and Why Is It Prescribed?

Perindopril is an angiotensin-converting enzyme (ACE) inhibitor commonly prescribed to treat high blood pressure (hypertension), heart failure, and to reduce the risk of cardiovascular events such as heart attacks and strokes. ACE inhibitors work by blocking an enzyme that produces angiotensin II, a substance that narrows blood vessels. By preventing this narrowing, perindopril helps blood vessels relax and widen, which lowers blood pressure and reduces the workload on the heart.

Perindopril is usually taken once daily, often in the morning, and it can take several weeks to reach its full effect. Common brand names include Coversyl, though many patients receive generic perindopril. Like all blood-pressure medicines, perindopril should be taken regularly as prescribed, even if you feel well, because high blood pressure often has no symptoms but can cause serious long-term damage if left untreated.

Why Men on Perindopril May Need ED Treatment

Erectile dysfunction is more common in men with high blood pressure and cardiovascular disease [10]. The same processes that damage blood vessels in the heart can also affect the smaller blood vessels in the penis. In fact, ED can be an early warning sign of heart disease, which is why it's important to see your GP if you develop new erection problems [1]. Treating high blood pressure with medicines like perindopril protects your heart and circulation, but some men still experience ED and may benefit from a PDE5 inhibitor such as tadalafil.

Can You Take Tadalafil and Perindopril Together?

Yes, tadalafil and perindopril can usually be taken together, and this combination is commonly prescribed in the UK [3][4]. There is no absolute contraindication between tadalafil and ACE inhibitors like perindopril. However, both medicines can lower blood pressure, so there is a potential for an additive effect—meaning your blood pressure might drop more than it would with either medicine alone.

This additive blood-pressure-lowering effect is usually manageable and does not prevent the combination from being used. Your prescriber will review your current blood pressure, any symptoms of low blood pressure (such as dizziness or fainting), and your overall cardiovascular health during the consultation. If your blood pressure is well controlled and you have no history of symptomatic low blood pressure, tadalafil is generally considered safe to use alongside perindopril [2].

It is essential to declare all your current medicines—including perindopril—when you request tadalafil through an online consultation or from your GP. Never take tadalafil without disclosing your blood-pressure medication, as the prescriber needs this information to assess safety and choose the right dose for you.

What you need to know

• Tadalafil and perindopril can usually be taken together safely with prescriber approval.
• Both medicines lower blood pressure, so your prescriber checks your readings and symptoms first.
• Always declare perindopril and all other medicines during your tadalafil consultation.
• Never take tadalafil with nitrates, nicorandil, or poppers—this combination is dangerous.
• Contact your GP if you experience persistent dizziness or any troublesome side effects.

How Tadalafil and Perindopril Interact in Your Body

Both tadalafil and perindopril cause blood vessels to relax, but they do so through different mechanisms. Perindopril blocks the production of angiotensin II, a hormone that constricts blood vessels, leading to a sustained reduction in blood pressure throughout the day. Tadalafil, on the other hand, increases levels of a molecule called cyclic GMP in the smooth muscle of blood vessels, particularly in the penis, which causes temporary relaxation and increased blood flow when you are sexually aroused [3][4].

Because both medicines promote blood vessel relaxation, taking them together can lead to a slightly greater drop in blood pressure than either medicine alone. For most men, this is not a problem and does not cause symptoms. However, some men may notice mild dizziness, light-headedness, or a feeling of faintness, especially when standing up quickly. These symptoms are more likely if you are dehydrated, have been drinking alcohol, or are taking other medicines that also lower blood pressure.

The interaction is not considered dangerous in most cases, but it does require careful prescriber assessment. Your prescriber will check your blood pressure readings, ask about any symptoms of low blood pressure, and may recommend starting tadalafil at a lower dose if there is any concern.

What About Other Blood Pressure Medicines?

If you take other blood-pressure medicines in addition to perindopril—such as a calcium-channel blocker (amlodipine, felodipine), a diuretic (bendroflumethiazide, indapamide), or a beta-blocker (bisoprolol, atenolol)—the same principle applies: the prescriber will assess the cumulative effect on your blood pressure. Multiple blood-pressure medicines can add to the blood-pressure-lowering effect of tadalafil, but this does not automatically rule out ED treatment. It simply means a more thorough assessment is needed, and you should be honest about all the medicines you take.

What Your Prescriber Will Check Before Approving Tadalafil

When you request tadalafil through Cured Pharmacy's online consultation, a UK-registered prescriber will review your medical history and current medicines, including perindopril. The prescriber will ask about your blood pressure readings, any history of dizziness or fainting, and whether you have any cardiovascular conditions such as angina, heart failure, or a recent heart attack or stroke [2].

The prescriber will also check for any contraindicated medicines. Tadalafil must never be taken with nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites), because these combinations can cause a dangerous drop in blood pressure [3][4]. Perindopril is not one of these contraindicated medicines, so the combination is not automatically ruled out.

If you are taking an alpha-blocker for prostate symptoms (such as tamsulosin or doxazosin) in addition to perindopril, the prescriber will take extra care, as alpha-blockers also lower blood pressure and can increase the risk of dizziness when combined with tadalafil. In such cases, you should be stable on the alpha-blocker before starting tadalafil, and the prescriber may recommend a lower starting dose [3].

When to get urgent help

• Chest pain during or after sex—call 999 immediately; do not take nitrates if you have used tadalafil in the past 48 hours
• Erection lasting more than 4 hours (priapism)—go to A&E immediately to prevent permanent damage
• Sudden loss of vision or hearing after taking tadalafil—stop the medicine and seek urgent medical advice
• Severe dizziness, fainting, or collapse—call 999 or go to A&E, especially if you cannot stand safely
• Allergic reaction (swelling of face, lips, tongue, or throat; difficulty breathing)—call 999 immediately

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

Practical Advice for Taking Tadalafil with Perindopril

If your prescriber approves tadalafil, take it exactly as directed. For on-demand tadalafil (10mg or 20mg), take one tablet at least 30 minutes before you plan to have sex; the effect can last up to 36 hours, so you do not need to rush [4]. For daily tadalafil (2.5mg or 5mg), take one tablet at the same time each day, regardless of when you plan to have sex. Do not take more than one dose in 24 hours.

Continue taking perindopril as prescribed by your GP—do not stop or change your blood-pressure medicine without medical advice. Monitor yourself for any symptoms of low blood pressure, such as dizziness, light-headedness, or feeling faint, especially when you first start tadalafil or if your perindopril dose is increased. These symptoms are usually mild and often settle as your body adjusts, but if they persist or are troublesome, contact your GP or pharmacist.

Avoid drinking large amounts of alcohol when taking tadalafil, as alcohol can lower blood pressure further and make side effects more likely. Grapefruit juice can increase tadalafil levels in your blood, so it is best to avoid it. Stay well hydrated, especially in hot weather or if you exercise, as dehydration can also contribute to low blood pressure. If you experience chest pain during sex, stop immediately and seek urgent medical help—do not take GTN or any nitrate medicine if you have used tadalafil in the past 48 hours [3].

When to Seek Medical Advice

Seek urgent medical help (call 999 or go to A&E) if you experience chest pain during or after sex, an erection lasting more than four hours (priapism), or sudden loss of vision or hearing after taking tadalafil [3][4]. Contact your GP or pharmacist promptly if you have persistent dizziness, fainting, or any other side effects that concern you. Never stop taking perindopril suddenly without medical advice, as this can cause your blood pressure to rise sharply.

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