Vardenafil Side Effects: How Long Do They Last?

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Key takeaways

• Most vardenafil side effects resolve within 4 to 5 hours as the medicine leaves your system.
• Common symptoms include headache, flushing, and nasal congestion, which are usually mild.
• Stay hydrated, rest, and take paracetamol if needed to manage headache or discomfort.
• Seek urgent help if you have an erection lasting over 4 hours or sudden vision or hearing loss.
• Alternatives such as sildenafil, tadalafil, or avanafil may suit you better if side effects persist.

Why Do Vardenafil Side Effects Occur?

Vardenafil belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels to improve blood flow to the penis during sexual stimulation [5]. However, PDE5 enzymes are also found in other parts of the body, including blood vessels in the face, nose, and digestive system. When vardenafil blocks these enzymes, it can temporarily affect these areas too, leading to side effects such as facial flushing, headache, stuffy nose, or indigestion.

These effects are not a sign that the medicine is harmful – they simply reflect how vardenafil works throughout the body. The intensity and type of side effects can vary from person to person, depending on factors such as dose, individual sensitivity, and whether you've taken the tablet with food or alcohol. Most men find that side effects are mild and become less noticeable with continued use as the body adjusts [5].

How Long Do Vardenafil Side Effects Last?

The duration of vardenafil side effects is closely linked to how long the medicine stays active in your body. Vardenafil typically reaches peak levels in your bloodstream about 30 to 60 minutes after taking it, and its effects on erections can last for around 4 to 5 hours [5]. Side effects generally follow a similar timeline, meaning that common symptoms such as headache, flushing, or nasal congestion usually begin within an hour of taking the tablet and fade as the medicine is cleared from your system.

For most men, side effects resolve completely within 4 to 5 hours. However, mild symptoms such as a slight headache or stuffy nose may occasionally linger a little longer, especially if you've taken a higher dose (such as 20 mg) or if your body metabolises the medicine more slowly. If you have liver or kidney problems, vardenafil may stay in your system longer, and side effects could persist for a few extra hours. Your prescriber will adjust your dose if needed to minimise this risk [5].

Factors That Influence Duration

Several factors can affect how long vardenafil side effects last. Taking vardenafil with a high-fat meal can delay absorption, meaning both the therapeutic effect and side effects may take longer to appear and resolve. Alcohol can also prolong or worsen side effects such as dizziness and headache, as it adds to the blood-pressure-lowering effect of the medicine. Additionally, certain medicines that slow the breakdown of vardenafil – such as potent CYP3A4 inhibitors like ritonavir, ketoconazole, or clarithromycin – can increase vardenafil levels in your blood, potentially extending the duration of side effects. Your prescriber will check all your current medicines during your consultation to avoid these interactions [5].

At a glance

Common Vardenafil Side Effects and Their Typical Duration

The most frequently reported side effects of vardenafil include headache, facial flushing, nasal congestion, and indigestion [5]. Headache is the most common, affecting around 1 in 10 men, and usually begins within an hour of taking the tablet. It tends to be mild to moderate and resolves within 4 to 5 hours as vardenafil levels decline. Flushing – a warm, red sensation in the face and neck – follows a similar pattern and is caused by temporary widening of blood vessels.

Nasal congestion or a stuffy nose is also common and typically clears within a few hours. Indigestion or heartburn may occur because vardenafil can relax the muscle at the top of the stomach, but this too is usually short-lived. Dizziness or light-headedness can happen, particularly if you stand up quickly, due to a temporary drop in blood pressure. This effect is more likely if you're also taking blood-pressure medicines or alpha-blockers, and it usually resolves within a few hours. If dizziness persists or is severe, contact your GP or pharmacist for advice [5].

Self-Care Tips to Manage Vardenafil Side Effects

If you experience a headache after taking vardenafil, drinking plenty of water and resting in a quiet, dimly lit room can help. Over-the-counter painkillers such as paracetamol are usually safe to take alongside vardenafil, but avoid aspirin or ibuprofen if you have any concerns about bleeding or stomach irritation – check with your pharmacist first. For flushing, staying cool and avoiding hot drinks or spicy foods around the time you take vardenafil may reduce the intensity of this side effect.

If nasal congestion is bothersome, a simple saline nasal spray (available without prescription) can provide relief. For indigestion, taking vardenafil on an empty stomach or avoiding heavy, fatty meals beforehand may help. If you feel dizzy, sit or lie down until it passes, and avoid driving or operating machinery. Reducing your alcohol intake and staying well hydrated can also minimise side effects. If symptoms are troublesome despite these measures, speak to your prescriber – they may suggest a lower dose or an alternative ED medicine [5].

When to Contact Your Prescriber

Most vardenafil side effects are mild and short-lived, but you should contact your GP or pharmacist if symptoms are severe, persist beyond 24 hours, or interfere significantly with your daily activities. If you experience chest pain during or after sex, stop sexual activity immediately and seek urgent medical help, as this could indicate a heart problem. Similarly, if you develop sudden loss of vision in one or both eyes, or sudden decrease or loss of hearing (sometimes with ringing in the ears or dizziness), stop taking vardenafil and contact a doctor straight away, as these are rare but serious side effects [5].

Rare but Serious Side Effects: How Long Do They Last?

Although uncommon, vardenafil can cause serious side effects that require immediate medical attention. Priapism – a painful erection lasting more than 4 hours – is a medical emergency. If not treated promptly, it can cause permanent damage to the penis. If you have an erection that lasts longer than 4 hours, go to A&E or call 999 immediately [5]. Another rare but serious side effect is sudden vision loss, which may be a sign of non-arteritic anterior ischaemic optic neuropathy (NAION). This condition can cause permanent vision loss and requires urgent assessment by an eye specialist.

Sudden hearing loss or a significant decrease in hearing, sometimes accompanied by tinnitus or dizziness, has also been reported rarely with PDE5 inhibitors. If this happens, stop taking vardenafil and seek medical advice the same day. Severe allergic reactions (such as swelling of the face, lips, tongue, or throat, or difficulty breathing) are extremely rare but require emergency treatment. These serious side effects do not resolve on their own within the usual 4 to 5 hour window and need professional intervention [5].

Alternatives If Vardenafil Side Effects Persist

If you find that vardenafil side effects are persistent or troublesome, there are several alternatives to consider. Other PDE5 inhibitors – such as sildenafil (generic Viagra), tadalafil (generic Cialis), or avanafil (Spedra) – work in a similar way but have different durations of action and side-effect profiles. For example, sildenafil lasts around 4 to 6 hours and may cause similar side effects to vardenafil, while tadalafil can remain active for up to 36 hours, which some men find more convenient but which may also mean side effects last longer [3][4][6].

Avanafil is a newer PDE5 inhibitor that works quickly (within 15 to 30 minutes) and may have a lower incidence of certain side effects such as flushing and nasal congestion [6][11]. Your prescriber can help you choose the most suitable option based on your health, lifestyle, and how you respond to treatment. If oral medicines are not suitable or effective, other options include alprostadil cream (Vitaros) or injection (Caverject), or non-medicine approaches such as vacuum erection devices or psychological therapy [2][7]. At Cured Pharmacy, our UK-registered prescribers review your medical history and current medicines during an online consultation to recommend the safest and most effective treatment for you.

Switching Between ED Medicines

If you wish to try a different ED medicine, never take two PDE5 inhibitors on the same day, as this can cause a dangerous drop in blood pressure. Allow at least 24 hours between switching from one to another, and always follow your prescriber's advice. Your prescriber will also check for any interactions with your current medicines – for example, if you take alpha-blockers for prostate symptoms or blood-pressure medicines, you may need to start on a lower dose of a new ED treatment. Do not stop or change any prescribed medicine without consulting your GP or pharmacist first [3][4][5][6].

When to get urgent help

• Erection lasting more than 4 hours (priapism) – go to A&E or call 999 immediately
• Sudden loss of vision in one or both eyes – stop vardenafil and seek urgent medical help
• Sudden decrease or loss of hearing, with or without ringing in the ears – contact a doctor the same day
• Chest pain during or after sex – stop activity and seek urgent medical attention
• Severe allergic reaction (swelling of face, lips, tongue, throat, or difficulty breathing) – call 999

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

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