The Priapus Shot vs. Penis Enlargement: Which Is More Effective?

Mark is 44. He has been researching his options for eight months. He has a folder on his phone with screenshots, bookmarked pages, and a few screenshots of before and after images he found on clinic websites. He is not sure what he wants exactly. He just knows something is not working as well as it used to, and he wants that to change.
Across the room sits Daniel. He is 38. He is less concerned about function. He wants size. He has looked at surgical options, pumps, and a range of injections. He has read about the p shot. He has also read about dermal filler enlargement procedures. He is not sure which one applies to him.
Both men are sitting in the same waiting room. They are researching the same general topic. But they are asking two very different questions.
This article addresses both questions directly. It explains what the Priapus Shot is, what penis enlargement injections involve, and what the evidence actually shows about each.

What Is the P Shot?
The p shot — formally called the Priapus Shot — is a treatment that uses platelet-rich plasma, or PRP. PRP is derived from the patient's own blood. A small sample is drawn, spun in a centrifuge to concentrate the platelets, and then injected into specific areas of the penis.
The theory behind the p shot is rooted in regenerative medicine. Platelets contain growth factors. These growth factors stimulate tissue repair, improve blood vessel formation, and support nerve function. The same principle is used in orthopaedics, dermatology, and wound healing.
In the context of male sexual health, the P shot London treatment targets erectile function. It aims to improve blood flow, sensitivity, and tissue quality. Some men also report modest gains in length or girth, though this is generally considered a secondary effect rather than the primary purpose.
The procedure takes around 60 to 90 minutes. Local anaesthetic cream is applied first. Most men describe the discomfort as minimal. There is no recovery period in the traditional surgical sense. Most patients return to normal activity the same day.

What Does Penis Enlargement Actually Mean?
This is where the terminology gets complicated. "Penis enlargement" covers several very different procedures.
Surgical Enlargement
Surgical options include ligament division, which can increase flaccid length, and fat transfer or implant procedures for girth. These carry real surgical risks: scarring, asymmetry, infection, loss of sensitivity, and in some cases, permanent damage. The NHS does not fund cosmetic penile surgery for size concerns alone, and NICE has not endorsed these procedures for routine use. Most reputable surgeons are cautious about offering them.
Dermal Filler Injections
A non-surgical alternative is hyaluronic acid filler injected into the shaft for girth enhancement. This is sometimes referred to as male enlargement injections. The results are temporary — typically lasting 12 to 18 months before the filler dissolves. The procedure is faster and less risky than surgery but still carries risks including nodule formation, asymmetry, and rarely, vascular complications.
Penile Injection Growth Claims
Some clinics market penile injection growth as part of a p shot package. It is important to be clear here. The p shot does not directly inject a filler or foreign substance into the tissue. It uses your own plasma. Any size increase associated with the priapus shot is a result of improved circulation, tissue regeneration, and in some cases, the use of a pump immediately after treatment to encourage engorgement during healing. This is a biological process, not a mechanical one.

Comparing the Two: What Are Men Actually Looking For?
The honest answer is that most men seeking either treatment are looking for one or more of the following:
Better erections
Improved sensitivity
Increased size (length or girth)
Greater confidence
The p shot primarily addresses the first two. It has a reasonable body of evidence behind it for erectile dysfunction, particularly in men who have not responded fully to oral medications like sildenafil. A 2019 study published in the Journal of Sexual Medicine found that PRP therapy improved erectile function scores in men with mild to moderate erectile dysfunction. The improvements were modest but statistically significant.
Dermal filler injections for girth, and surgical options for length, address the size concern more directly. But they do not improve function. A man who has poor blood flow and weak erections will not resolve that problem with filler. He may end up with a larger but still poorly functioning penis. That is not a good outcome.
This is a critical distinction. Function and size are separate issues. Treating the wrong one achieves nothing.

What the Evidence Shows
PRP therapy has a growing evidence base in sexual medicine. It is not yet classified as a first-line treatment by major guidelines, but it is increasingly accepted as a legitimate adjunct, particularly for men with mild to moderate erectile dysfunction, Peyronie's disease, or those recovering post-prostatectomy.
The British Society for Sexual Medicine acknowledges PRP as an area of emerging evidence. It does not yet have a formal NICE recommendation, but it is actively researched and used in reputable clinical settings across the UK.
Dermal filler for girth is less well-studied in terms of long-term safety data. Short-term satisfaction rates vary. A 2020 study in Aesthetic Plastic Surgery found reasonable patient satisfaction at three months, but a notable proportion reported irregularities or requested correction procedures by 12 months.
Surgical enlargement carries the most risk and the most variable results. For most men, the risk-to-benefit ratio does not favour surgery unless there is a clinical indication beyond cosmetic preference.
For a broader independent overview of PRP treatments in aesthetic and regenerative medicine, provides useful context on how these therapies are being used across clinical specialties.
The Priapus Shot Price: What to Expect in the UK
The priapus shot price in the UK varies. In London, particularly in clinics on or near Harley Street, p shot treatment typically costs between £800 and £2,000 per session. The variation reflects clinic overheads, the experience of the practitioner, and the number of sessions included in the package.
Male enlargement injections cost UK-wide can range from £1,500 to £4,000 for filler, depending on the volume used and the clinic. Surgical options run considerably higher, from £4,000 to over £10,000, not including anaesthetist fees or aftercare.
The P shot UK market has grown significantly in the last five years. This growth reflects both increased awareness and a genuine demand among men seeking non-surgical options. It also reflects the fact that more men are talking openly about sexual health concerns — which was far less common a decade ago.

P Shot Before and After: What to Realistically Expect
One of the most searched topics related to this treatment is p shot before and after outcomes. Men want to see proof.
The honest picture is this. P-shot before and after results vary from person to person. Men with underlying vascular issues tend to respond well to improved blood flow. Men with psychogenic erectile dysfunction may see less benefit. Men who are generally healthy but experiencing age-related decline in function are often good candidates.
In terms of size, any increase reported after p shot treatment is generally modest — typically less than an inch in length and a small improvement in girth during erection. These are not the dramatic before and after images some commercial websites suggest. Clinics that promise significant enlargement from a p injection alone should be viewed with scepticism.
What most men do report after p shot treatment, when performed correctly, is:
Firmer, more reliable erections
Increased sensitivity
Faster recovery time between erections
Improved confidence
These are meaningful outcomes. They are also realistic ones.

Safety and Regulation in the UK
This is an important area. The UK aesthetic industry is partially regulated, but not uniformly so. Dermal filler injections, including those used for penile girth enhancement, were brought under prescriber-only rules following the Health and Care Act 2022. This was a significant step. Previously, non-medically trained practitioners could legally administer these procedures.
PRP treatments, including the p shot, involve blood processing and injection into sensitive tissue. They should only be performed by qualified medical professionals — ideally those with specific training in male sexual health or aesthetic medicine.
Patients seeking Priapus shot London treatment should always verify the credentials of any practitioner before proceeding. Ask to see qualifications. Ask where the practitioner trained. Ask how many procedures they have performed.

Which Is More Effective?
The direct answer depends entirely on what the patient is trying to achieve.
For erectile function, sensitivity, and tissue health, the priapus shot has the better evidence base and the stronger safety profile. It uses the body's own biology. The risks are low when performed by a qualified clinician. The results, while not guaranteed, are often meaningful.
For size specifically, filler injections offer more predictable girth results in the short term, though they require maintenance and carry their own risks. Surgery offers the most significant structural change but also the most significant risk.
The two approaches are not interchangeable. They address different problems. A man who primarily wants better function should not be sold a filler procedure. A man who primarily wants girth and has no erectile difficulties is not the ideal candidate for a p injection alone.
The most effective approach is always the one matched to the individual's actual concern, anatomy, and health status — arrived at through honest clinical assessment, not marketing.

The conversation around male sexual health has shifted. Men are asking better questions and demanding clearer answers. The priapus shot and penile enlargement procedures exist on different parts of the same spectrum. One focuses on restoring and enhancing function. The other focuses on changing structure. Both have legitimate applications. Neither is universally superior.
What matters is an accurate diagnosis of the problem, a qualified practitioner to perform the procedure, and realistic expectations going in. The men who get the best outcomes are the ones who understood what they were actually trying to fix before they walked through the clinic door.
So before you book anything — are you certain which problem you are actually trying to solve?