Vardenafil and Nortriptyline: Can You Take Them Together?

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What Is Vardenafil and How Does It Work?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED) in adult men [5]. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing increased blood flow when you're sexually aroused [5]. Vardenafil is the generic version of the branded medicine Levitra and is available in 5mg, 10mg, and 20mg tablets.

You typically take vardenafil about 25 to 60 minutes before sexual activity, and it can remain effective for several hours [5]. The medicine only works when you're sexually stimulated—it won't cause an erection on its own. Vardenafil is broken down in the body by liver enzymes, particularly one called CYP3A4, which is important when considering interactions with other medicines [5].

Common side effects include headache, flushing, nasal congestion, and indigestion [5]. Like all PDE5 inhibitors, vardenafil can lower blood pressure slightly, which is usually not a problem for healthy men but becomes important when combined with certain other medicines or health conditions [5].

What Is Nortriptyline and Why Is It Prescribed?

Nortriptyline is a tricyclic antidepressant (TCA) commonly prescribed for depression, nerve pain (neuropathic pain), and sometimes to prevent migraines. It works by increasing levels of certain natural chemicals in the brain, particularly noradrenaline and serotonin, which help improve mood and reduce pain signals.

Tricyclic antidepressants like nortriptyline have been used for decades and are effective for many people, though they can cause side effects such as dry mouth, constipation, drowsiness, and dizziness. One important effect of nortriptyline is that it can affect your heart rhythm and blood pressure, particularly when you stand up quickly (called postural hypotension).

Nortriptyline is broken down in the liver by several enzymes, including CYP2D6. It can also affect the electrical activity of the heart (the QT interval on an ECG), which is why doctors monitor patients carefully, especially when other medicines are added. Understanding how nortriptyline works in your body helps explain why your prescriber needs to review the combination with vardenafil carefully.

Can Nortriptyline Contribute to Erectile Dysfunction?

It's worth knowing that tricyclic antidepressants, including nortriptyline, can sometimes contribute to erectile dysfunction as a side effect. This happens because these medicines can affect nerve signals and blood flow. If you've noticed ED since starting nortriptyline, it's important to discuss this with your GP—they may be able to adjust your dose or consider alternative treatments. However, never stop taking nortriptyline without medical advice, as stopping suddenly can cause withdrawal symptoms.

When to get urgent help

• An erection lasting more than 4 hours (priapism)—go to A&E immediately to prevent permanent damage.
• Sudden loss of vision in one or both eyes—stop vardenafil and seek urgent medical help.
• Chest pain during or after sex—stop activity, sit down, and call 999 if pain does not resolve quickly.
• Severe dizziness, fainting, or a very fast or irregular heartbeat—seek same-day medical advice.
• Sudden loss of hearing or ringing in the ears—stop vardenafil and contact your GP or NHS 111 promptly.

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

The Interaction Between Vardenafil and Nortriptyline Explained

When considering vardenafil and nortriptyline together, there is no major direct drug interaction that would make the combination absolutely contraindicated. However, both medicines can affect your cardiovascular system, which means your prescriber needs to assess the overall picture carefully.

Both vardenafil and nortriptyline can lower blood pressure. Vardenafil does this by relaxing blood vessels, while nortriptyline can cause postural hypotension (a drop in blood pressure when you stand up). When taken together, there's a theoretical risk that these effects could add up, potentially causing dizziness, light-headedness, or fainting, particularly when you change position quickly.

Additionally, both medicines can have effects on heart rhythm. Nortriptyline can prolong the QT interval (a measure of electrical activity in the heart), and while vardenafil's effect on QT interval is generally minimal at standard doses, your prescriber will consider your overall cardiac risk. This is especially important if you have any existing heart conditions or take other medicines that affect heart rhythm.

The good news is that for most men, this combination can be managed safely with appropriate monitoring and dose selection. Your prescriber will review your full medical history, current medicines, and any heart conditions before deciding whether vardenafil is suitable for you while taking nortriptyline.

What Your Prescriber Checks Before Approving Vardenafil

When you request vardenafil while taking nortriptyline, your prescriber will conduct a thorough assessment during your online consultation. They'll ask about your current dose of nortriptyline, how long you've been taking it, and whether you've experienced any side effects, particularly dizziness or heart palpitations.

Your prescriber will review your cardiovascular health in detail. They'll ask about your blood pressure, any history of heart disease, chest pain, heart rhythm problems, or previous heart attacks or strokes. They'll also want to know about any other medicines you're taking, as some combinations with vardenafil are not safe (such as nitrates, nicorandil, or riociguat).

If you have any risk factors—such as low blood pressure, a history of fainting, or other heart medications—your prescriber may start you on the lowest dose of vardenafil (5mg) to minimise the risk of side effects. They'll also provide specific advice about monitoring for dizziness or light-headedness, particularly when you first start treatment or if your nortriptyline dose changes.

Medicines That Must Never Be Taken With Vardenafil

Regardless of whether you take nortriptyline, there are certain medicines you must never take with vardenafil. Do not take vardenafil if you use nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs called 'poppers' (amyl or alkyl nitrites) [5]. Combining vardenafil with any of these can cause a dangerous drop in blood pressure. Never take vardenafil with another PDE5 inhibitor (such as sildenafil, tadalafil, or avanafil) at the same time [5].

At a glance

Practical Safety Advice When Taking Vardenafil and Nortriptyline

If your prescriber approves vardenafil while you're taking nortriptyline, there are several practical steps you can take to use it safely. Start with the lowest effective dose—your prescriber will likely recommend 5mg or 10mg initially. Take vardenafil about 25 to 60 minutes before you plan to have sex, and remember it only works with sexual stimulation [5].

Be aware of how you feel when you stand up, particularly in the first few hours after taking vardenafil. If you feel dizzy or light-headed, sit or lie down until the feeling passes. Avoid standing up quickly from a sitting or lying position. It's also wise to avoid heavy alcohol when taking vardenafil, as alcohol can worsen erectile dysfunction and add to the blood-pressure-lowering effects of both medicines.

Keep your prescriber and pharmacist informed of any changes to your nortriptyline dose or if your doctor adds any new medicines. If you experience any unusual symptoms—such as a fast or irregular heartbeat, severe dizziness, fainting, or chest discomfort—stop taking vardenafil and seek medical advice promptly. Most men tolerate the combination well, but individual responses can vary, so listen to your body and report any concerns.

Other ED Treatment Options Available at Cured Pharmacy

If you have concerns about taking vardenafil with nortriptyline, or if your prescriber recommends an alternative, Cured Pharmacy offers a range of licensed ED treatments. All PDE5 inhibitors work in a similar way, but they differ in how quickly they start working and how long they last.

Sildenafil (generic Viagra) is available from £0.45 per tablet (or £0.36 with first-order code Ednew) and is taken about one hour before sex [3]. Tadalafil (generic Cialis) costs from £7.95 (£6.36 with code Ednew) and can last up to 36 hours, offering more spontaneity [4]. Avanafil (Spedra) works in as little as 15 to 30 minutes and is priced at £20.95 (£16.76 with code Ednew) [6].

All of these medicines require a prescription and are only supplied after an online consultation reviewed by a UK prescriber. The same safety considerations apply—your prescriber will review your nortriptyline and overall health to determine which ED treatment, if any, is most suitable for you. The interaction profile with nortriptyline is similar across all PDE5 inhibitors, so the choice often comes down to your lifestyle preferences and how quickly you want the medicine to work.

When to See Your GP About Erectile Dysfunction

If you're experiencing erectile dysfunction for the first time, it's important to see your GP for a full assessment [1]. ED can be an early warning sign of underlying health conditions such as heart disease, diabetes, or high blood pressure [1]. Your GP can check for these conditions and discuss whether your nortriptyline or any other medicines might be contributing to the problem. They can also provide advice on lifestyle changes—such as exercise, weight management, and reducing alcohol—that can improve erectile function [2].

In summary

• No major direct interaction between vardenafil and nortriptyline is commonly reported, but both can affect blood pressure.
• Your prescriber will review your heart health and may start you on the lowest vardenafil dose.
• Watch for dizziness or light-headedness, especially when standing up, and avoid heavy alcohol.
• Never take vardenafil with nitrates, nicorandil, riociguat, or poppers—this is dangerous.
• All ED treatments at Cured Pharmacy require an online consultation reviewed by a UK prescriber.

Frequently Asked Questions