How Many Inches Does a P-Shot Add? An Honest Answer From a London Doctor

✅ Medically reviewed | Updated July 2026

This is one of the most searched questions about the P-Shot — and one of the most misleadingly answered. Type it into Google and you will find bold claims, vague statistics, and marketing copy designed to get you to book a consultation rather than give you a straight answer.

This article does the opposite. It gives you an honest, clinically grounded answer about what the P-Shot can and cannot do in terms of size — who is likely to notice a difference, how significant that difference tends to be, and why size is often the least important outcome to focus on when considering this treatment.

What Is the P-Shot and Why Does Size Come Up?

The P-Shot — formally known as the Priapus Shot — is a non-surgical treatment that uses platelet-rich plasma (PRP) drawn from your own blood to stimulate tissue repair, improve blood flow, and support nerve renewal inside penile tissue. It was developed primarily as a treatment for erectile dysfunction, reduced sensitivity, and Peyronie’s disease.

Size was never the primary purpose of the P-Shot. It emerged as a reported secondary outcome in some patients — and because it generates searches, it generates content. But the clinical reality is more nuanced than most of what you will read online.

For a full explanation of what the P-Shot actually involves, how the procedure works, and what it is primarily designed to treat, visit the P-Shot treatment page at Dr SNA Clinic.

How Many Inches Does the P-Shot Actually Add?

The honest answer is: the P-Shot is not a size enhancement procedure, and any size changes that occur are modest, variable, and secondary to its primary biological effects.

Some men do report a modest increase in girth following the P-Shot. This is plausible biologically — PRP stimulates collagen and elastin production inside the corpora cavernosa, the spongy chambers that fill with blood during erection. Improved tissue quality and better blood flow can result in fuller, firmer erections, which some men interpret and measure as size improvement.

Published data and clinical reports suggest the following, where size changes do occur:

• Girth increases of up to around 1 cm are the most commonly reported change — not inches, centimetres. This is at the more optimistic end of reported outcomes.
• Length changes are less consistent and typically smaller than girth changes, if they occur at all.
• Not every patient notices any size change. A meaningful proportion of men who undergo the P-Shot do not notice a measurable difference in dimensions.
• Where size changes do occur, they tend to emerge gradually over eight to twelve weeks as new blood vessels form and tissue quality improves — not immediately after the procedure.

Some competitor clinics in the UK quote figures such as “up to 1.3 inches of length and 1.1 inches of girth.” These figures represent the upper end of reported outcomes from a small proportion of patients and should not be taken as typical or expected results. Quoting maximum outlier results as representative outcomes is misleading — and at Dr SNA Clinic, we do not do that.

Why Does the P-Shot Sometimes Affect Size at All?

Understanding the biology makes the reported outcomes make more sense — and helps set realistic expectations.

The P-Shot works by injecting platelet-rich plasma into penile tissue. The growth factors in PRP stimulate several biological processes:

Angiogenesis — the formation of new capillary networks. More blood vessels means more blood flow during arousal, which supports fuller erections.

Collagen and elastin production — PRP encourages production of these structural proteins inside the corpora cavernosa. Healthier, more elastic tissue supports better engorgement during erection.

Neurogenesis — growth factors support nerve fibre renewal, which improves sensitivity and the quality of the erectile response.

None of these mechanisms are designed to add tissue. The P-Shot does not inject filler, fat, or any volume-adding substance. It does not physically expand the penis. What it does — in suitable patients — is improve the quality and completeness of erection by rebuilding vascular and nerve function. For men whose erections have been less full or firm than previously, this improvement in erection quality can manifest as what feels and measures like increased size — because the erection is simply more complete.

This is a meaningful distinction. If a man’s erectile function has declined due to age, diabetes, or vascular factors, a better-quality erection may feel considerably larger and firmer than what he has been experiencing. That is a real and valuable outcome. It is not the same as a permanent anatomical enlargement.

What the P-Shot Is Actually Good For — The Real Outcomes

If you are primarily searching for size enhancement, it is worth being direct: the P-Shot is not the most appropriate treatment for that goal, and any clinician who presents it primarily as a size enhancement procedure is not being straight with you.

The P-Shot delivers its most consistent, meaningful results in these areas:

Erectile function. For men with mild to moderate vascular-related erectile dysfunction, the P-Shot targets the underlying biology — rebuilding blood vessel networks and tissue quality. This is where the evidence base is strongest and where patients consistently report meaningful improvement.

Penile sensitivity. Nerve fibre renewal is one of the most reliably reported outcomes. Many men describe restored or significantly improved sensation as the most valuable change they experience. This directly improves sexual satisfaction — independent of any size change.

Peyronie’s disease. The anti-inflammatory and tissue-remodelling properties of PRP may help reduce fibrous plaque and soften scar tissue, reducing curvature and discomfort over time.

Reduced reliance on medication. For men who have been using PDE5 inhibitors (Viagra, Cialis) with diminishing returns, the P-Shot addresses the physiological cause rather than chemically compensating for it. Some men find they need medication less often or at lower doses after treatment.

Confidence. This is underrated in clinical discussions but genuinely significant. When erection quality, reliability, and sensitivity improve, the psychological dimension of sexual confidence improves alongside it. That has value that goes well beyond what any measurement captures.

For a full clinical overview of outcomes, timeline, pricing, and suitability, visit the P-Shot treatment London.

How Long Do Any Size Changes From the P-Shot Last?

Where girth or size improvements are reported, they typically reflect improved erection quality rather than permanent anatomical change. This means:

• Changes tend to be most noticeable at peak erectile function — at the point of full arousal
• Results from a single P-Shot last approximately 12 months on average
• Annual maintenance sessions help sustain the improvement in erectile quality over time
• Any change in perceived girth correlates with the longevity of the PRP effect — it is not a permanent structural change

If permanent size enhancement is your primary goal, a consultation with a clinician who can explain the full range of appropriate options is the right starting point. The P-Shot may be part of that conversation — but it should be presented honestly within it.

What About a Vacuum Device After the P-Shot?

Some clinics recommend using a vacuum erection device (penis pump) after the P-Shot. The rationale is that the device creates negative pressure, drawing blood into the tissue during the period when PRP is actively stimulating growth factors. This may enhance the uptake of PRP into penile tissue and support the improvements in blood flow.

Some providers credit consistent pump use with more noticeable girth improvements in the weeks following treatment. If a vacuum device is recommended as part of your P-Shot aftercare, following that advice consistently is worth taking seriously — it is part of the treatment protocol, not an optional extra.

At Dr SNA Clinic, Dr Abbas discusses aftercare — including vacuum device use where clinically appropriate — directly with every patient before they leave the clinic.

Who Is a Good Candidate for the P-Shot?

The patients who get the most from the P-Shot are those who are realistic about what it does and who have a genuine physiological need it can address.

You are likely a suitable candidate if you:

• Have mild to moderate erectile dysfunction with a vascular component
• Have noticed a reduction in penile sensitivity over time
• Have Peyronie’s disease or related scar tissue
• Have had prostate surgery or pelvic radiotherapy that affected erectile function
• Want a drug-free, non-surgical approach that addresses the underlying cause
• Are realistic about outcomes — seeking functional improvement rather than dramatic size transformation

The P-Shot is generally not appropriate if:

• Your primary and only goal is size enhancement with no erectile or sensitivity concerns
• You have an active genital infection
• You have a bleeding disorder or take anticoagulants that cannot be safely paused
• You are currently undergoing cancer treatment in the pelvic region
• You have unrealistic expectations about the degree of size change possible

A face-to-face consultation is the only way to properly assess suitability and have an honest conversation about what you can realistically expect. At Dr SNA Clinic, if the P-Shot is not the right option for your situation, Dr Abbas will tell you clearly — before any commitment is made.

About Dr Syed Nadeem Abbas — P-Shot Expert at Dr SNA Clinic London

Every P-Shot at Dr SNA Clinic is performed personally by Dr Syed Nadeem Abbas, MBBS, MRCSEd, MSc (Distinction) — from the blood draw through to the final injection. He does not delegate this procedure.

Dr Abbas spent over six years in NHS Trauma and Orthopaedics at major hospitals including Cambridge and Oxford — giving him a surgical-level understanding of anatomy and tissue physiology that directly informs how he approaches regenerative injectable treatments. He holds postgraduate membership of the Royal College of Surgeons of Edinburgh (MRCSEd) and an MSc in Aesthetic Plastic Surgery with Distinction from Queen Mary University of London.

He holds formal P-Shot certification through the American Cellular Medical Association — making him one of a very small number of UK-based physicians with this specific credential. He uses a dual-spin centrifuge protocol that produces a significantly higher platelet concentration than standard single-spin methods. The clinic is CQC regulated and holds a 4.9-star Google rating from verified patient reviews.

For a plain-language video explanation of the P-Shot — how it works, what it treats, and what patients can realistically expect — visit the Dr SNA Clinic YouTube channel.

P-Shot Pricing at Dr SNA Clinic London

Treatment	Price	What Is Included
Standard P-Shot	£1,250	Dual-spin PRP, numbing, all injections by Dr Abbas, 6 and 12-week follow-ups
Enhanced P-Shot + Shockwave	£1,350	Everything above plus low-intensity shockwave therapy
Initial consultation	£100	Fully redeemable against treatment cost

Address: 48 Wimpole Street, Marylebone, London W1G 8SF Phone: +44 7955 836986 Hours: Monday to Saturday, 10:00–18:00

Related Reading From Dr SNA Clinic

• P-Shot London — Full Treatment Overview and Pricing
• Is the P-Shot Worth Getting? An Honest Answer
• P-Shot for Erectile Dysfunction: What the Evidence Says
• P-Shot for Peyronie’s Disease: What Early Research Shows
• Can the P-Shot Help With Low Libido? What Patients Need to Know
• 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