Vardenafil NICE Guidelines Explained

Takes less than 2 minutes to complete 100% online

Vardenafil NICE Guidelines: What You Need to Know

Published: 9 November 2026

The vardenafil nice guidelines, published by the National Institute for Health and Care Excellence (NICE), recommend vardenafil as one of several effective phosphodiesterase type 5 (PDE5) inhibitors for treating erectile dysfunction (ED) in men [2]. NICE guidance confirms that vardenafil, sildenafil, tadalafil and avanafil are all suitable first-line options, with the choice depending on individual preference, how quickly the medicine works, how long it lasts, and cost [2]. Vardenafil is taken about 25–60 minutes before sexual activity and requires sexual stimulation to work.

What Do NICE Guidelines Say About Vardenafil?

NICE Clinical Knowledge Summaries (CKS) on erectile dysfunction state that vardenafil is an effective PDE5 inhibitor licensed for the treatment of ED [2]. The guidelines do not rank one PDE5 inhibitor above another; instead, they recommend that the choice should be guided by the person's preference, the onset and duration of action, side-effect profile, and cost [2]. Vardenafil is available in 5 mg, 10 mg and 20 mg tablets, with 10 mg being the usual starting dose for most men [5].

NICE emphasises that all PDE5 inhibitors, including vardenafil, should only be used when ED has been confirmed and any underlying causes (such as cardiovascular disease, diabetes or psychological factors) have been considered [2]. The guidelines recommend that men with new or worsening ED should see their GP for assessment, as ED can be an early warning sign of heart disease or other health conditions [1][2]. A prescriber will review your medical history, current medicines and overall health before deciding whether vardenafil is suitable for you.

How Does Vardenafil Work According to NICE Guidance?

Vardenafil works by blocking an enzyme called phosphodiesterase type 5 (PDE5), which helps relax the blood vessels in the penis and allows increased blood flow during sexual arousal [5]. This mechanism is the same for all PDE5 inhibitors recommended by NICE [2]. Vardenafil does not cause an erection on its own—sexual stimulation is still needed for the medicine to work [5].

The British National Formulary (BNF), which supports NICE prescribing, states that vardenafil is usually taken about 25–60 minutes before sexual activity, and its effects can last for several hours [5]. The maximum recommended dose is one tablet per day [5]. NICE guidance highlights that response to PDE5 inhibitors can vary between individuals, so if one medicine does not work well or causes side effects, switching to a different PDE5 inhibitor may be helpful [2].

Onset and Duration of Action

Vardenafil typically starts to work within 25–60 minutes, making it faster than sildenafil (about 1 hour) but slower than avanafil (15–30 minutes) [5][6]. Its effects last for several hours, though not as long as tadalafil, which can remain effective for up to 36 hours [4]. This intermediate profile makes vardenafil a useful option for men who want a relatively quick onset without the very long duration of tadalafil.

Vardenafil NICE Guidelines on Safety and Contraindications

NICE and the BNF are clear that vardenafil must never be taken with nitrates (such as GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs called 'poppers' (amyl or alkyl nitrites) [2][5]. Combining vardenafil with any of these can cause a dangerous drop in blood pressure [5]. Vardenafil should also not be taken alongside another PDE5 inhibitor [5].

Men taking alpha-blockers (such as doxazosin, tamsulosin, alfuzosin or terazosin) for prostate symptoms or high blood pressure need special care, as the combination can cause dizziness or low blood pressure [5]. The prescriber will usually start with the lowest dose of vardenafil and ensure the patient is stable on the alpha-blocker [5]. Vardenafil is contraindicated or requires dose adjustment in men taking potent CYP3A4 inhibitors (such as ritonavir, cobicistat, ketoconazole, itraconazole or clarithromycin), as these medicines raise vardenafil levels in the blood [5]. The prescriber will check the Summary of Product Characteristics (SmPC) for detailed guidance [12].

Vardenafil is not suitable for men with severe heart or liver problems, very low blood pressure, recent stroke or heart attack, unstable angina, or a history of non-arteritic anterior ischaemic optic neuropathy (NAION, a form of sudden vision loss) [5]. Sexual activity itself carries some cardiovascular risk, so NICE recommends that fitness for sexual activity should be assessed before prescribing any PDE5 inhibitor [2].

How Does Vardenafil Compare to Other PDE5 Inhibitors Under NICE Guidance?

NICE guidelines do not state that one PDE5 inhibitor is better than another; all four licensed options—sildenafil, tadalafil, vardenafil and avanafil—are considered equally effective for most men [2]. The choice depends on individual circumstances, including how quickly you want the medicine to work, how long you want the effect to last, side effects, and cost [2]. Sildenafil is often chosen first because it is the least expensive option and has been used the longest [2][3]. Tadalafil is popular for its long duration (up to 36 hours) and is also available as a low-dose daily tablet [4].

Vardenafil sits between sildenafil and avanafil in terms of onset time and offers a good balance for men who find sildenafil too slow or tadalafil's long duration unnecessary [5]. Avanafil has the fastest onset (15–30 minutes) and may suit men who prefer spontaneity [6][11]. Cost is an important factor: generic sildenafil is significantly cheaper than vardenafil, tadalafil or avanafil, which may influence choice when clinical factors are equal [2].

Switching Between PDE5 Inhibitors

NICE guidance supports switching to a different PDE5 inhibitor if the first choice is not effective or causes troublesome side effects [2]. Some men respond better to one medicine than another, even though they all work in a similar way. Your prescriber can help you try a different option if vardenafil does not meet your needs. Never take two PDE5 inhibitors together or within 24 hours of each other.

Vardenafil Dosing and Administration: NICE Recommendations

The BNF, which informs NICE prescribing, states that the usual starting dose of vardenafil is 10 mg, taken about 25–60 minutes before sexual activity [5]. Depending on effectiveness and tolerability, the dose can be increased to 20 mg or reduced to 5 mg [5]. Only one dose should be taken in any 24-hour period [5]. Vardenafil can be taken with or without food, though a very high-fat meal may delay its onset [5].

For older men (aged 65 and over) or those with moderate liver impairment, the starting dose is usually 5 mg [5]. Men with severe liver or kidney problems may not be able to take vardenafil at all, or may need a significantly reduced dose under close medical supervision [5]. Your prescriber will adjust the dose based on your age, health conditions and other medicines.

What to Do If Vardenafil Does Not Work

If vardenafil does not work after several attempts, NICE recommends reviewing the diagnosis, checking that the medicine is being taken correctly (with sexual stimulation, at the right time, and not after a heavy meal), and considering whether any underlying health issues or medicines might be interfering [2]. Your prescriber may suggest trying a different PDE5 inhibitor, adjusting the dose, or referring you for specialist assessment if needed [2]. Psychological factors, relationship issues and lifestyle factors (such as smoking, heavy alcohol use or lack of exercise) can all affect response to treatment [1][2].

Getting Vardenafil: Prescription and Consultation Process

Vardenafil is a prescription-only medicine in the UK, so you will need a consultation with a prescriber before it can be supplied [5]. At Cured Pharmacy, a GPhC-registered online pharmacy (GPhC 9012511), you can complete a confidential online consultation that will be reviewed by a UK-registered prescriber. The prescriber will check your medical history, current medicines, and any conditions that might make vardenafil unsuitable or require dose adjustment.

If vardenafil is appropriate for you, your prescription will be dispensed and dispatched discreetly. Vardenafil (generic Levitra) is available at Cured Pharmacy for £16.95, or £13.56 for first orders with code Ednew. Other PDE5 inhibitors are also available, including Sildenafil from £0.45 (£0.36 with code Ednew) and Tadalafil from £7.95 (£6.36 with code Ednew), giving you choice and flexibility in line with NICE guidance [2]. All prescription medicines require clinical approval following your consultation, and the prescriber may suggest an alternative if vardenafil is not the best option for your circumstances.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 9 November 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 9 November 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 9 November 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 9 November 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 9 November 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 9 November 2026]
7. National Institute for Health and Care Excellence. (2014). Erectile dysfunction: avanafil (ESNM45). https://www.nice.org.uk/advice/esnm45 [accessed 9 November 2026]
8. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 9 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.