Vardenafil 10mg vs 20mg: Which Dose Is Right?

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How Vardenafil Works for Erectile Dysfunction

Vardenafil is the generic version of Levitra and works by blocking an enzyme called phosphodiesterase type 5 (PDE5). When you're sexually aroused, your body releases a chemical called nitric oxide, which helps relax the smooth muscle in the blood vessels of the penis, allowing more blood to flow in and produce an erection [5]. PDE5 normally breaks down the substances that keep this process going, so by inhibiting PDE5, vardenafil helps maintain higher levels of these substances, making it easier to achieve and sustain an erection when you're sexually stimulated.

It's important to understand that vardenafil—whether 10mg or 20mg—does not cause an automatic erection. Sexual stimulation is still required for the medicine to work [5]. Vardenafil is taken on-demand, meaning you take a tablet about 25 to 60 minutes before you plan to have sex, and it can remain effective for several hours. Because it's a prescription medicine, you'll need a consultation with a UK prescriber who will check your medical history, current medications, and overall health to ensure vardenafil is safe and suitable for you.

Vardenafil 10mg vs 20mg: Onset and Duration

Both vardenafil 10mg and 20mg are designed to be taken approximately 25 to 60 minutes before sexual activity, and the onset time is generally similar for both strengths [5]. Some men may notice effects slightly sooner, but it's best to allow at least half an hour for the medicine to start working. The higher 20mg dose does not make vardenafil work faster—it simply provides a stronger effect, which may be helpful if the 10mg dose hasn't been effective enough.

The duration of action is also comparable between the two doses. Vardenafil can remain active in your system for around four to five hours, though this varies from person to person [5]. During this window, you should find it easier to get and keep an erection when sexually aroused. The 20mg dose does not significantly extend how long the medicine lasts; instead, it may provide a more robust response during that time frame. Neither dose should be taken more than once in a 24-hour period, regardless of strength.

Does Food Affect Vardenafil?

Vardenafil can be taken with or without food, but high-fat meals may delay how quickly it starts to work [5]. If you've just eaten a large, fatty meal—such as a burger and chips or a rich curry—it may take longer for the tablet to be absorbed, meaning you might not feel the effects as quickly. For the most reliable onset, consider taking vardenafil on an empty stomach or after a light meal. This advice applies equally to both the 10mg and 20mg doses.

When to get urgent help

• Erection lasting more than 4 hours (priapism)—call 999 or go to A&E immediately
• Sudden loss of vision or hearing—stop taking vardenafil and seek urgent medical help
• Chest pain during or after sex—stop activity and call 999
• Severe dizziness or fainting—seek same-day medical advice from your GP or NHS 111

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

Comparing Vardenafil 10mg and 20mg Strengths

Vardenafil is available in three strengths in the UK: 5mg, 10mg, and 20mg [5]. The 10mg dose is the standard starting strength for most men, as it balances effectiveness with a lower risk of side effects. Clinical trials have shown that 10mg is effective for many men with ED, and starting at this dose allows your prescriber to assess how well you tolerate the medicine. If 10mg doesn't provide the desired improvement, your prescriber may increase the dose to 20mg, which is the maximum recommended dose.

The 20mg dose contains twice the amount of active ingredient, which can lead to a stronger effect but also a higher chance of experiencing side effects such as headache, flushing, or nasal congestion [5]. It's not the case that everyone needs or benefits from the higher dose—many men find 10mg perfectly adequate. Your prescriber will consider factors such as your overall health, other medications you're taking, and how you've responded to previous treatments when recommending a dose. It's important never to adjust your dose yourself; always follow the guidance of your healthcare professional.

Can You Split a 20mg Tablet?

Some men wonder whether they can split a 20mg vardenafil tablet to create two 10mg doses. While some tablets are scored and designed to be split, you should only do this if your prescriber or pharmacist has specifically advised it and the tablet is suitable for splitting. Not all formulations break evenly, and splitting can affect how the medicine is absorbed. Always check with your healthcare provider before altering any tablet.

Side Effects: Vardenafil 10mg vs 20mg

The side effects of vardenafil are generally dose-related, meaning they can be more common or more noticeable at higher doses [5]. Common side effects include headache, facial flushing, nasal congestion, indigestion, and dizziness. These are usually mild and temporary, often improving as your body adjusts to the medicine. With the 10mg dose, many men experience few or no side effects, while the 20mg dose may increase the likelihood or intensity of these reactions.

Serious side effects are rare but require immediate medical attention. These include a prolonged erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sexual activity [5]. If you experience any of these, stop taking vardenafil and seek urgent help by calling 999 or going to A&E. It's also important to report any side effects to your prescriber, as they may adjust your dose or suggest an alternative treatment. The balance between effectiveness and tolerability is key, and starting on the lower 10mg dose allows you to find that balance safely.

At a glance

Who Should Use Vardenafil 10mg vs 20mg?

The choice between vardenafil 10mg and 20mg depends on individual factors including your response to treatment, overall health, and any other medicines you're taking. Most men will start on 10mg, as this is the recommended initial dose for the majority of patients [5]. If you're new to ED treatment, have mild to moderate ED, or are generally healthy, 10mg is often the most appropriate starting point. It provides a good chance of effectiveness while minimising the risk of side effects.

The 20mg dose is typically reserved for men who have tried 10mg and found it insufficiently effective, or for those with more severe ED where a stronger response is needed [5]. However, not everyone can safely take the higher dose. Men taking certain other medications—such as potent CYP3A4 inhibitors like ritonavir, ketoconazole, or clarithromycin—may need to avoid vardenafil altogether or use a much lower dose, as these drugs can significantly increase vardenafil levels in the blood. Similarly, if you're on alpha-blockers for prostate problems or high blood pressure, your prescriber will need to assess the risk of low blood pressure and may start you on the lowest possible dose. Your prescriber will review your full medical history and current medications during your consultation to determine the safest and most effective dose for you.

When to Speak to Your GP

If you're experiencing ED for the first time, it's a good idea to see your GP before starting any treatment [1][2]. ED can be an early warning sign of underlying health conditions such as heart disease, diabetes, or high blood pressure, so a full assessment is important. Your GP can arrange tests, discuss lifestyle changes, and refer you to a specialist if needed. Once any underlying causes have been addressed, an online consultation with a UK prescriber can be a convenient way to access ongoing treatment.

Getting Vardenafil Through Cured Pharmacy

At Cured Pharmacy, we offer vardenafil (generic Levitra) through a straightforward online consultation process. All prescriptions are reviewed by a UK-registered prescriber who will check your medical history, current medications, and overall suitability for vardenafil. This ensures you receive safe, personalised care without needing to visit a GP surgery or pharmacy in person. Our service is discreet, and your medicine is delivered in plain, unmarked packaging to your home or another address of your choice.

Vardenafil is available at Cured Pharmacy for £16.95, or £13.56 for your first order when you use the code Ednew at checkout. This price applies to both the 10mg and 20mg strengths, and your prescriber will recommend the most appropriate dose based on your consultation. If vardenafil isn't suitable for you, we also offer other ED treatments including sildenafil (from £0.45), tadalafil (from £7.95), and avanafil (Spedra, £20.95), giving you a range of options to find the treatment that works best for your lifestyle and needs. All our medicines are sourced from licensed UK suppliers and meet the highest quality standards.

In summary

• Vardenafil 10mg is the standard starting dose for most men with ED
• The 20mg dose may be used if 10mg is not effective enough
• Both doses work within 25 to 60 minutes and last around four to five hours
• Higher doses can increase the chance of side effects like headache and flushing
• Always consult a prescriber before changing your vardenafil dose

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