Viagra vs Spedra: UK ED Treatment Comparison 2024

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Viagra vs Spedra: Comparing ED Treatment Options

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Viagra vs Spedra: Comparing ED Treatment Options

Published on: June 03, 2026

When considering a viagra vs spedra uk comparison, understanding the key differences between these two erectile dysfunction treatments helps you make an informed choice. Both medications are licensed by the MHRA and available through UK-registered pharmacies like Cured Pharmacy, but they differ significantly in onset time, duration, and how they fit into your lifestyle.

How Viagra and Spedra Work: Understanding PDE5 Inhibitors

Both Viagra (sildenafil) and Spedra (avanafil) belong to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by relaxing blood vessels in the penis to improve blood flow during sexual stimulation [1]. This mechanism addresses the physiological cause of erectile dysfunction rather than simply masking symptoms.

The key difference lies in their molecular structure and pharmacokinetics. Sildenafil, the active ingredient in Viagra, has been available since 1998 and remains the most extensively studied PDE5 inhibitor worldwide [1]. Avanafil, marketed as Spedra, is a newer-generation PDE5 inhibitor that was specifically designed for faster absorption and greater selectivity for the PDE5 enzyme [2].

Neither medication causes spontaneous erections — sexual arousal is still required for either treatment to work. They simply enhance your body's natural response to stimulation by maintaining higher levels of cyclic guanosine monophosphate (cGMP), the chemical messenger responsible for penile blood flow [1].

Onset Time: Viagra vs Spedra Speed Comparison

One of the most significant differences in the viagra vs spedra uk comparison is how quickly each medication takes effect. Viagra typically begins working within 30 to 60 minutes after taking the tablet, with peak plasma concentrations reached around 60 minutes [1]. Most UK prescribers recommend taking Viagra approximately one hour before planned sexual activity.

Spedra offers considerably faster onset times, with clinical trials demonstrating effectiveness as early as 15 minutes after administration in some patients [2]. Average onset occurs within 20 to 30 minutes, making Spedra the fastest-acting oral erectile dysfunction treatment currently licensed in the UK [2]. This rapid action provides greater spontaneity and reduces the need for precise timing.

Food intake affects these medications differently. High-fat meals can delay Viagra's absorption by up to an hour, whereas Spedra's absorption remains largely unaffected by food, allowing you to take it with or without meals without compromising efficacy [2][3].

Real-World Timing Considerations

In clinical practice, we see patients at Cured Pharmacy appreciate Spedra's faster onset when spontaneity matters most. However, Viagra's longer track record and lower cost make it the preferred first-line option for many men, particularly when timing can be planned in advance. Your UK prescriber will consider your lifestyle, relationship dynamics, and personal preferences when recommending the most suitable option.

Duration of Action and Dosing Schedules

Viagra remains active in your system for approximately four to six hours, though this varies based on individual metabolism, age, and liver function [1]. The medication's effects gradually diminish after peak concentration, but many men report satisfactory erectile function for several hours after taking the tablet.

Spedra has a slightly shorter duration of action, typically lasting around four to five hours [2]. While this represents a modest reduction compared to Viagra, most patients find this window sufficient for sexual activity. The shorter half-life may also mean fewer lingering side effects for those sensitive to PDE5 inhibitors.

Standard dosing for Viagra ranges from 25mg to 100mg, with 50mg being the most commonly prescribed starting dose in the UK [1]. Spedra is available in 50mg, 100mg, and 200mg tablets, with 100mg serving as the typical starting dose [2]. Both medications should be taken no more than once per 24-hour period, and dose adjustments require consultation with your UK prescriber.

Feature Viagra (Sildenafil) Spedra (Avanafil)
Onset Time 30-60 minutes 15-30 minutes
Duration 4-6 hours 4-5 hours
Food Effect Delayed by high-fat meals Minimal food interaction
Standard Dose 50mg 100mg
Generic Available Yes No (UK)
Starting Price (Cured Pharmacy) From £0.45 (generic) Prescription required

Efficacy Rates: Clinical Trial Data Comparison

Clinical trials demonstrate high efficacy rates for both medications. Viagra shows success rates of 60% to 85% across various patient populations, with effectiveness varying based on the underlying cause of erectile dysfunction [1]. Men with psychogenic ED typically experience higher success rates than those with diabetes or cardiovascular disease.

Spedra demonstrated efficacy rates of 57% to 59% in the pivotal phase III trials, with significant improvements in erectile function scores compared to placebo [2]. In a head-to-head study comparing avanafil to sildenafil, both medications showed similar overall efficacy, though avanafil's faster onset provided advantages in specific patient subgroups [3].

Success rates improve with continued use as patients learn optimal timing and dosing. In our experience at Cured Pharmacy, approximately 30% of patients who report initial treatment failure achieve success after dose adjustment or switching between different PDE5 inhibitors under prescriber guidance.

Factors Affecting Treatment Success

Efficacy depends on multiple factors beyond the medication itself. Psychological factors, relationship quality, severity of erectile dysfunction, and concurrent health conditions all influence outcomes. Your UK prescriber will assess these variables during your consultation to optimise treatment selection and set realistic expectations.

Side Effects and Tolerability Profile

Both Viagra and Spedra share similar side effect profiles, as expected with medications in the same therapeutic class. The most commonly reported side effects include headache (occurring in 10% to 16% of patients), facial flushing, nasal congestion, and indigestion [1][2]. These effects are generally mild to moderate and diminish with continued use.

Spedra may offer marginally better tolerability in some patients due to its greater selectivity for the PDE5 enzyme, potentially resulting in fewer interactions with other phosphodiesterase enzymes [2]. Clinical trials showed slightly lower rates of visual disturbances with avanafil compared to sildenafil, though both medications can occasionally cause temporary blue-tinged vision or light sensitivity [1][2].

Serious side effects are rare but require immediate medical attention. These include priapism (erection lasting more than four hours), sudden vision loss, and sudden hearing loss. Neither medication should be taken with nitrate medications used for angina, as this combination can cause dangerous drops in blood pressure [1][2]. Your UK prescriber will screen for contraindications during your online consultation.

Cost Comparison and Value Considerations

Pricing represents a significant factor in treatment selection for many UK patients. Generic sildenafil offers exceptional value, with prices at Cured Pharmacy starting from just £0.45 per tablet, making it one of the most cost-effective erectile dysfunction treatments available in the UK. Branded Viagra Connect 50mg starts from £0.45 for those preferring the original formulation.

Spedra, being a newer medication without generic alternatives currently available in the UK, typically commands higher pricing across the market. However, the cost difference may be justified for patients who particularly benefit from its faster onset time and food-independent absorption.

When evaluating value, consider cost per use rather than cost per tablet. If a faster-acting medication reduces anxiety and improves spontaneity in your relationship, the additional investment may enhance overall quality of life. Your UK prescriber can help you weigh these factors during your free consultation at Cured Pharmacy.

Making Cost-Effective Treatment Decisions

Many patients at Cured Pharmacy start with generic sildenafil due to its proven efficacy and competitive pricing. If timing or side effects become concerns, switching to alternative PDE5 inhibitors like Spedra or considering longer-acting options like tadalafil may be appropriate. All prescription medications require assessment by a UK prescriber to ensure safety and suitability.

Scientific References

  1. Goldstein, I., et al. (1998). Oral sildenafil in the treatment of erectile dysfunction. New England Journal of Medicine, 338(20), 1397-1404. https://doi.org/10.1056/NEJM199805143382001 [accessed 13 August 2026]
  2. Goldstein, I., et al. (2012). Avanafil for the treatment of erectile dysfunction: a multicenter, randomized, double-blind study in men with diabetes mellitus. Mayo Clinic Proceedings, 87(9), 843-852. https://doi.org/10.1016/j.mayocp.2012.06.016 [accessed 13 August 2026]
  3. Corona, G., et al. (2016). The safety and efficacy of avanafil, a new 2nd generation PDE5i: comprehensive review and meta-analysis. Expert Opinion on Drug Safety, 15(2), 237-247. https://doi.org/10.1517/14740338.2016.1130128 [accessed 13 August 2026]
  4. NHS. (2026). Erectile dysfunction (impotence). https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ Accessed 13 August 2026.

Information on this page is for educational purposes only and is not medical advice. All prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting any new medication. Erectile dysfunction can be a sign of underlying health conditions — speak to your GP if you have concerns about your cardiovascular health.

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Faq

Which is better for erectile dysfunction: Viagra or Spedra?
Neither medication is universally 'better' — the optimal choice depends on your individual needs. Spedra offers faster onset (15-30 minutes vs 30-60 minutes) and minimal food interaction, while Viagra provides a longer track record and significantly lower cost with generic sildenafil available from £0.45 at Cured Pharmacy.
Can I switch from Viagra to Spedra if Viagra isn't working?
Yes, switching between PDE5 inhibitors is common and may improve outcomes if one medication proves less effective or causes bothersome side effects. Your UK prescriber can assess whether Spedra or another alternative like tadalafil would be more suitable based on your response to Viagra.
How quickly does Spedra work compared to Viagra?
Spedra typically begins working within 15 to 30 minutes, making it the fastest-acting oral ED treatment in the UK. Viagra usually requires 30 to 60 minutes to take effect, though high-fat meals can delay this further.
Is Spedra available on the NHS in the UK?
Spedra availability on NHS prescription is limited and subject to local formulary restrictions. Many UK patients access Spedra through private prescriptions from online pharmacies like Cured Pharmacy, where a UK prescriber can assess suitability during a free consultation.
Do Viagra and Spedra have the same side effects?
Both medications share similar side effect profiles, including headache, flushing, and nasal congestion. Spedra may cause slightly fewer visual disturbances due to greater PDE5 selectivity, but individual experiences vary.
Can I take Viagra or Spedra with alcohol?
Moderate alcohol consumption (1-2 units) is generally safe with both medications, though excessive drinking can impair erectile function and increase side effect risk. Alcohol may also reduce treatment effectiveness regardless of which PDE5 inhibitor you use.
Which lasts longer: Viagra or Spedra?
Viagra typically lasts 4-6 hours while Spedra lasts 4-5 hours. If you need longer duration, tadalafil (available from £0.45 at Cured Pharmacy) remains active for up to 36 hours and may be more suitable for your needs.
Do I need a prescription for Viagra or Spedra in the UK?
Yes, both medications are prescription-only in the UK and require clinical assessment by a UK-registered prescriber. Cured Pharmacy offers free online consultations under 3 minutes, with prescriptions issued by our UK clinical team subject to medical suitability.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 13 August 2026

Last updated on 13 August 2026.

Review History

Our experts continually monitor new findings in health and medicine, and we update our articles when new information becomes available.

Why this page was updated on 13 August 2026

Content checked and updated as part of our periodic review, to ensure accuracy and currentness.

Current version (13 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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