✅ Medically reviewed | Updated July 2026

You have done your research. You have read the forums, watched the videos, and finally booked your PRP appointment, hoping for firmer erections, better sensitivity, and renewed confidence. Then… nothing changes. Or worse, the results fade within weeks. If this sounds familiar, you are not alone, and you are certainly not imagining it. The causes of PRP failure are more common than most clinics admit, and the reasons behind them are rarely explained clearly to patients before they commit their money and hope to the process.

This article breaks down exactly what causes PRP failure, why so many men experience disappointing results, and what actually separates a treatment that works from one that quietly fizzles out. We will also show you how a properly delivered P Shot London treatment, backed by clinical technique and doctor-led care, avoids these common pitfalls entirely.

What Is PRP and Why Does It Sometimes Fail?

Platelet-Rich Plasma therapy uses your own blood to stimulate tissue repair. Doctors draw a small blood sample, spin it in a centrifuge, and inject the concentrated plasma back into the treatment area. The growth factors inside PRP trigger new blood vessel formation, collagen production, and nerve regeneration.

That sounds simple, but the science only works if every step of the process is executed correctly. When even one stage falls short, patients end up with an injection that looks the same on paper but delivers none of the biological benefit they were promised.

The Real Causes of PRP Failure

Weak Blood Quality Going In

The strength of your PRP depends entirely on the blood you start with. Men with low platelet counts, poor circulation, uncontrolled diabetes, or chronic health issues naturally produce a weaker concentrate. No centrifuge can manufacture growth factors that were never there to begin with.

Single-Spin Processing Instead of Dual-Spin

Many clinics rely on basic single-spin centrifuge methods that separate blood quickly but inefficiently. This produces a diluted plasma sample with far fewer active platelets. A dual-spin protocol, by contrast, concentrates platelets to a significantly higher density, giving the growth factors real work to do once injected.

The Injector Lacks Specialist Training

This is one of the biggest, and least discussed, causes of PRP failure. Male PRP injections, including the Priapus shot, require precise anatomical placement. Nurses or aestheticians without specific penile anatomy training frequently miss the corpora cavernosa or inject too shallow, meaning the growth factors never reach the tissue that needs them.

Choosing the Wrong Candidate for the Treatment

PRP works best for mild to moderate erectile dysfunction with a vascular component. Clinics that treat every patient the same way, regardless of the underlying cause, set unrealistic expectations. Severe nerve damage or advanced structural issues rarely respond to PRP alone, and an honest clinic will say so before you pay.

Too Few Sessions or No Follow-Up Plan

A single injection with no structured follow-up rarely produces the full biological response. Growth factors need time to stimulate angiogenesis and nerve renewal, and clinics that skip proper follow-up consultations miss the chance to adjust or repeat treatment when needed.

Medications, Smoking, and Alcohol Interfering With Results

NSAIDs, blood thinners, heavy smoking, and excessive alcohol intake all suppress platelet function or restrict blood flow. Even a perfectly prepared PRP sample cannot overcome a lifestyle that is actively working against it.

Ignoring Aftercare Instructions

Resuming strenuous activity or sexual intercourse too soon after treatment can disrupt the healing tissue before the growth factors finish their work. Aftercare is not an optional extra; it is part of the treatment itself.

Why the P-Shot at Dr SNA Clinic Avoids These Pitfalls

Understanding the causes of PRP failure naturally raises the next question: how do you actually avoid them? At Dr SNA Clinic in London, Dr Syed Nadeem Abbas built the entire P Shot treatment around solving exactly these failure points.

Doctor-Led Injections, Not Delegated Care

Every P-Shot at the clinic is performed personally by Dr Abbas, from blood draw through to final injection. He does not hand this procedure to junior staff. His surgical background in Trauma and Orthopaedics across NHS hospitals in Cambridge and Oxford gives him the precise anatomical knowledge that male PRP injections demand.

A Genuine Dual-Spin Protocol

The clinic uses advanced dual-spin centrifuge technology that concentrates platelets to a level well above standard single-spin methods used elsewhere. Higher platelet concentration means the growth factors actually have the power to regenerate tissue, rather than simply diluting the injection.

Honest Candidate Assessment

Dr Abbas reviews your full medical history before recommending treatment. If the p shot is unlikely to help your specific situation, he tells you plainly, rather than pushing you toward an expensive procedure that was never going to work.

What Happens During Your Appointment

Your P Shot appointment at 48 Wimpole Street, Marylebone, London W1G 8SF takes between 30 and 40 minutes from start to finish. Dr Abbas applies topical numbing cream (or a penile nerve block on request), draws a small blood sample, processes it through the dual-spin centrifuge for around 15 minutes, and then delivers the injections using ultra-fine needles across four to five precise sites.

You can walk out and return to normal activities, including work and driving, the same day. The clinic advises abstaining from sexual activity for four to five days to let the treated tissue settle. This structured, unhurried process is precisely the opposite of the rushed, single-visit approach that so often leads to disappointing outcomes elsewhere.

Want to see the process explained directly by Dr Abbas? You can watch the full walkthrough on the Dr SNA Clinic YouTube channel, where he covers exactly what happens at each stage of the treatment.

Priapus Shot Price and What’s Included

Transparent pricing is another area where many clinics fall short, quoting “price on consultation” instead of a clear figure. Dr SNA Clinic publishes its Priapus shot price openly:

• Standard P-Shot: £1,250 (dual-spin PRP included)
• Enhanced P-Shot + Shockwave: £1,350, combining PRP with low-intensity shockwave therapy for men whose erectile dysfunction has a stronger vascular component

Every package includes a consultation with Dr Abbas, dual-spin PRP processing, numbing or nerve block anesthesia, the injection itself, and both a six-week and twelve-week follow-up consultation. 0% finance is available, so cost never has to be a barrier to proper, doctor-led care. To check current availability, call +44 7955 836986 or book online, with reception hours running 10:00 to 18:00 UK time.

How to Give Your PRP Treatment the Best Chance of Success

• Choose a clinic that uses dual-spin processing, not basic single-spin methods
• Confirm the injection is performed by a qualified doctor, not delegated staff
• Be honest about medications, smoking, and alcohol use before treatment
• Attend every scheduled follow-up appointment
• Follow aftercare instructions precisely, including activity restrictions
• Ask for realistic expectations based on your specific diagnosis, not generic promises

Skipping any one of these steps is often exactly where PRP treatment quietly starts to fail.

Frequently Asked Questions

Can PRP fail even at a good clinic?
Yes. Even with correct technique, individual biology varies, and results depend on age, general health, and the underlying cause of the concern. This is why realistic expectations matter as much as the injection itself.

How soon will I know if my P-Shot has worked?
Most patients notice early changes around the four-week mark, with the fullest results typically visible between eight and twelve weeks, once new blood vessel formation and tissue renewal have progressed.

Does a failed PRP treatment mean I cannot try again?
Not necessarily. A second, correctly administered session, ideally combined with a review of lifestyle factors, often produces a very different outcome than the first attempt.

Is P Shot before and after evidence reliable?
It should be treated as illustrative rather than guaranteed. Genuine before and after results depend heavily on the individual case, which is why a proper consultation matters more than any single photo online.

Final Thought

PRP failure is rarely random. It almost always traces back to one of a handful of preventable factors: weak processing, poor injection technique, the wrong candidate, or inconsistent aftercare. Understanding these causes puts you in a much stronger position to choose a clinic that gets the fundamentals right the first time, rather than learning the hard way after an expensive disappointment.

Reading from Dr SNA Clinic

• P-Shot London — Full Treatment Overview and Pricing
• Is the P-Shot Worth Getting? An Honest Answer
• P-Shot Treatment for Diabetic ED: Is PRP an Option?
• Erectile Dysfunction Treatment UK: Every Option Explained Honestly
• P-Shot Side Effects: What Are the Risks and How Common Are They?

Dr Syed Nadeem Abbas, MBBS, MRCSEd, MSc Aesthetic Plastic Surgery (Distinction) Medical Director, Dr SNA Clinic 48 Wimpole Street, Marylebone, London W1G 8SF GMC Registered | CQC Regulated | Monday to Saturday 10:00–18:00 +44 7955 836986 | info@drsnaclinic.com