Vardenafil and Rivastigmine: Can They Be Taken Together?

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Vardenafil and Rivastigmine: Understanding the Interaction

Published: 4 November 2026

Many men wonder whether vardenafil and rivastigmine can be taken together safely. Vardenafil (generic Levitra) is a prescription medicine used to treat erectile dysfunction (ED), while rivastigmine is a cholinesterase inhibitor prescribed for dementia, including Alzheimer's disease and Parkinson's disease dementia. The good news is that no major interaction between these two medicines is commonly reported in clinical practice, but your prescriber will still carefully review your full medical history and all current medications during your consultation to ensure the combination is appropriate for you.

What Is Vardenafil and How Does It Work?

Vardenafil is one of a group of medicines called PDE5 inhibitors, licensed in the UK to treat erectile dysfunction [5]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. This helps you get and keep an erection suitable for sexual activity.

Vardenafil is available in 5mg, 10mg, and 20mg tablets. The usual starting dose is 10mg, taken about 25 to 60 minutes before sexual activity, with a maximum of one dose per day [5]. It requires sexual stimulation to work and does not increase sexual desire on its own.

Like all PDE5 inhibitors, vardenafil can lower blood pressure slightly. This is usually not a problem for most men, but it becomes important when considering other medicines you take, particularly those that also affect blood pressure or are broken down by the same liver enzymes.

At Cured Pharmacy, vardenafil is available on prescription after an online consultation reviewed by a UK-registered prescriber. The consultation ensures the medicine is safe and suitable for your individual circumstances, including any other medications you are taking.

What Is Rivastigmine and Why Is It Prescribed?

Rivastigmine is a cholinesterase inhibitor used to treat mild to moderate dementia in people with Alzheimer's disease or Parkinson's disease [12]. It works by increasing levels of acetylcholine, a chemical messenger in the brain that is important for memory, thinking, and reasoning.

Rivastigmine is available as capsules, oral solution, and skin patches. It does not cure dementia but may help slow the worsening of symptoms for a period of time. Common side effects include nausea, vomiting, loss of appetite, dizziness, and headache, particularly when starting treatment or increasing the dose.

The medicine is usually started at a low dose and gradually increased over several weeks to reduce side effects. It is typically taken twice daily with food if using capsules or liquid, or applied once daily if using patches.

Because rivastigmine affects the nervous system and can cause dizziness or fainting (especially when standing up), prescribers are careful when it is combined with other medicines that might also lower blood pressure or cause similar side effects.

Can Vardenafil and Rivastigmine Be Taken Together?

There is no well-documented major interaction between vardenafil and rivastigmine that would make the combination unsafe for most people. These medicines work through different mechanisms in the body: vardenafil affects blood flow to the penis via the PDE5 enzyme, while rivastigmine affects acetylcholine levels in the brain.

However, both medicines can potentially cause dizziness or a drop in blood pressure, particularly when standing up. Rivastigmine can slow the heart rate in some people, and vardenafil can cause a modest reduction in blood pressure. When taken together, these effects might add up, increasing the risk of feeling dizzy or lightheaded.

Your prescriber will assess your overall health, including your heart and blood pressure, before approving vardenafil. They will review all your current medications, including rivastigmine, to check for any potential problems. If you have a history of fainting, very low blood pressure, or significant heart problems, extra caution may be needed.

It is essential to declare rivastigmine (and all other medicines, including over-the-counter products and supplements) during your online consultation. Never stop or change your dementia medication without speaking to the doctor who prescribed it, as this could worsen your symptoms.

What Your Prescriber Will Check

During your consultation, the prescriber will ask about your cardiovascular health, blood pressure, and any history of dizziness or fainting. They will want to know how well controlled your dementia symptoms are and whether you have experienced side effects from rivastigmine, particularly dizziness or changes in heart rate.

If you are taking other medicines alongside rivastigmine—such as blood pressure tablets, heart medications, or other drugs that can affect the nervous system—the prescriber will consider the combined effect. They may recommend starting vardenafil at the lowest effective dose (5mg or 10mg) and monitoring how you respond.

Your prescriber will also ensure that you do not have any absolute contraindications to vardenafil, such as taking nitrates, nicorandil, riociguat, or another PDE5 inhibitor. These combinations can cause a dangerous drop in blood pressure and must never be used together [5].

Practical Advice for Taking Vardenafil and Rivastigmine Together

If your prescriber approves vardenafil while you are taking rivastigmine, there are some practical steps you can take to minimise any risk of side effects. Take vardenafil exactly as prescribed, usually starting with a lower dose to see how your body responds.

Be cautious when standing up from sitting or lying down, particularly in the first few hours after taking vardenafil. Both medicines can cause dizziness, so moving slowly and steadying yourself can help prevent falls. Avoid heavy alcohol, as it can make dizziness worse and reduce the effectiveness of vardenafil.

If you experience unusual dizziness, fainting, a very slow or fast heartbeat, or chest pain, stop taking vardenafil and seek medical advice promptly. These could be signs that the combination is affecting your heart or blood pressure more than expected.

Keep your GP and any specialists involved in your dementia care informed that you are using an ED treatment. This ensures all your healthcare providers have a complete picture of your medications and can coordinate your care effectively. Never share your vardenafil with anyone else, even if they take rivastigmine, as each person's medical situation is unique.

Other Medicines That Interact with Vardenafil

While vardenafil and rivastigmine do not have a major documented interaction, vardenafil does interact significantly with several other types of medicine. Never take vardenafil 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 fall in blood pressure [5].

Alpha-blockers (such as doxazosin, tamsulosin, or alfuzosin), often prescribed for prostate problems or high blood pressure, can also interact with vardenafil. The combination increases the risk of dizziness and low blood pressure. If you take an alpha-blocker, you must be stable on it, and your prescriber will usually start you on the lowest dose of vardenafil.

Potent CYP3A4 inhibitors—including some HIV medicines (ritonavir, cobicistat), antifungals (ketoconazole, itraconazole), and antibiotics (clarithromycin)—can raise vardenafil levels in your blood. Vardenafil is often contraindicated or requires dose adjustment with these medicines, so your prescriber must check the specific combination [5].

Grapefruit juice can also increase vardenafil levels and should be avoided. If you take any other prescription or over-the-counter medicines, herbal remedies, or supplements, declare them all during your consultation so the prescriber can check for interactions.

Medicines That Do Not Mix with Vardenafil

Do not take vardenafil if you are using any form of nitrate medicine for angina or chest pain, including GTN spray, tablets, or patches, isosorbide mononitrate, or isosorbide dinitrate. Do not take it with nicorandil (another angina medicine) or riociguat (used for pulmonary hypertension). These combinations can cause a severe and potentially life-threatening drop in blood pressure [5].

Never take vardenafil alongside another PDE5 inhibitor, such as sildenafil (Viagra), tadalafil (Cialis), or avanafil (Spedra). Using two PDE5 inhibitors together does not improve effectiveness and significantly increases the risk of side effects.

Avoid recreational drugs called 'poppers' (amyl nitrite or alkyl nitrites), as these also cause a dangerous interaction with vardenafil. If you are unsure whether any medicine or substance you use is safe with vardenafil, ask your prescriber or pharmacist before taking it.

When to Seek Medical Help and Next Steps

Seek urgent medical help (call 999 or go to A&E) if you experience an erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sexual activity. These are rare but serious side effects that require immediate treatment [5].

If you feel very dizzy, faint, or notice an unusually slow or irregular heartbeat after taking vardenafil, especially in combination with rivastigmine, stop taking the ED medicine and contact your GP or NHS 111 for advice the same day. These symptoms may indicate that the combination is affecting your heart or blood pressure.

Erectile dysfunction can be an early warning sign of heart disease, diabetes, or other health conditions [1]. If you have not already done so, see your GP for a full health check, particularly if ED is a new problem. Your GP can investigate underlying causes and coordinate your care with any specialists managing your dementia.

At Cured Pharmacy, our online consultation is reviewed by UK-registered prescribers who will assess whether vardenafil is safe and appropriate for you, taking into account rivastigmine and all your other medicines. If approved, your treatment is dispensed by our GPhC-registered pharmacy and delivered discreetly to your door. You can also contact our pharmacist team if you have questions about your medicines at any time.

How to Order Vardenafil from Cured Pharmacy

To order vardenafil, complete a short online consultation on the Cured Pharmacy website. You will be asked about your medical history, current medications (including rivastigmine), and any symptoms or health conditions. A UK-registered prescriber will review your answers to ensure vardenafil is safe and suitable for you.

If approved, your prescription will be dispensed by our GPhC-registered pharmacy (GPhC 9012511) and dispatched in discreet, unbranded packaging. You can choose from a range of delivery options, including next-day delivery. If the prescriber has any concerns or needs more information, they will contact you before approving your order.

Our pharmacist team is available to answer questions about your treatment, side effects, or interactions. You can also update your consultation at any time if your health or medications change, ensuring your treatment remains safe and effective.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 4 November 2026]
2. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 4 November 2026]
3. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 4 November 2026]

Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.

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