Blood Thinners, Aspirin or Ibuprofen Before PRP Hair Treatment: What to Tell the Clinic

If you take a prescribed blood thinner, daily aspirin or regular anti-inflammatory painkillers such as ibuprofen, tell the clinic before booking PRP hair treatment, and do not stop any prescribed medicine on your own. Whether a medicine should be paused is a decision for the person who prescribed it and the clinician giving the treatment. Published evidence does not give one rule that fits everyone, and clinics' own instructions differ.

This guide explains why the question comes up, what the evidence does and does not show, and how to prepare. It cannot tell you whether you are suitable for PRP. Progen's own pre-treatment instructions are not set out here.

Why medicines matter for PRP

PRP (platelet-rich plasma) is prepared from a sample of your own blood, which is spun in a centrifuge to concentrate the platelets before it is used on the scalp. Some common medicines affect how platelets behave, which is why clinics ask about them.

Two systematic reviews looked at this, both published in an orthopaedic sports-medicine journal, so they concern PRP in general rather than hair treatment:

• A 2022 systematic review of 20 studies found that aspirin and acetaminophen (paracetamol) significantly reduced platelet aggregation, and that NSAIDs did so only in non-selective formulations. COX-2-selective NSAIDs and statins did not. None of these medicines significantly reduced platelet count. The authors suggested considering suspending aspirin, paracetamol and non-selective NSAIDs before a PRP injection because they may blunt its effect, and that statins and COX-2-selective NSAIDs do not need to be withheld.
• A 2020 systematic review of 15 studies found that 8 reported reduced growth factors or mitogenesis with antiplatelet or anti-inflammatory drugs, and concluded that more studies are needed.

Neither review measured hair growth. I did not find hair-specific evidence showing that any particular medicine changes the result of PRP for hair loss, so the stop-windows you will see online are clinic protocols rather than established standards.

What different medicines raise

Medicine type	What the sources say	What to do
Prescribed anticoagulants (for example warfarin or rivaroxaban)	The NHS says anticoagulants may not mix well with ibuprofen and with aspirin. Clinics differ: one lists anticoagulant therapy as unsuitable for PRP, another says to stop blood thinners only with your doctor's approval.	Never stop or change the dose yourself. Tell the clinic and the prescriber or anticoagulation service.
Daily low-dose aspirin	The NHS says that if you regularly take low-dose aspirin you should keep taking it unless advised to stop. The 2022 review above suggests considering suspending it before PRP.	These two positions conflict, so ask the prescriber and the clinic together.
Ibuprofen, naproxen and similar painkillers	The 2022 review found an effect on platelets for non-selective NSAIDs only. Clinic windows range from a few days to one week to ten days, with no evidence cited.	Ask the clinic which pain relief it advises, rather than choosing a window from a website.
Paracetamol	The 2022 review found reduced platelet aggregation, yet some clinics name paracetamol as the pain relief to use.	Ask which painkiller the clinic accepts for you.
Supplements (for example fish oil or vitamin E)	Some clinics ask patients to avoid them before treatment, without citing studies. The NHS advises telling your doctor about all medicines, herbal remedies, vitamins and supplements.	Include them on your medicines list.

A dental example shows where this decision usually sits. Scottish dental guidance advises that people on warfarin with a suitable INR can usually be treated without interrupting the medicine, because interruption carries a risk of serious clots, and that the dose is managed by the patient's own medical practitioner or anticoagulation service. This is dental guidance and does not apply directly to PRP, but it shows why a cosmetic clinic should not be the one deciding to stop a medicine.

Minoxidil and finasteride

The NHS says minoxidil and finasteride work only while you use them, so stopping them is not a neutral step. A 2024 meta-analysis of five randomised trials compared PRP added to topical minoxidil with minoxidil alone; it reported higher hair density with the combination, but rated the certainty of evidence low to very low, and three of the five trials had a high risk of bias. That tests adding PRP to minoxidil; it does not tell you how to time the two around a session. One clinic page suggests waiting about three days after treatment before using minoxidil; another page does not address the question. I found no evidence on finasteride and PRP timing.

Ask the clinic whether and when to use any hair-loss medicine around your sessions, and do not change a prescription yourself.

Why not to stop a medicine for PRP

The evidence that PRP helps is itself limited. A 2024 meta-analysis of 13 randomised trials reported a mean increase of 27.55 hairs per cm² (95% CI 14.04 to 41.06), but described the studies as highly heterogeneous, low quality and affected by publication bias. Low-dose aspirin, by contrast, is taken to lower the chance of a heart attack or stroke. Weighing a possible cosmetic benefit against stopping a medicine prescribed for your health is a question for your prescriber.

What to bring to the consultation

• A full list of medicines, including over-the-counter painkillers, supplements and anything you use on the scalp, with doses.
• Why each prescribed medicine was started and who prescribes it.
• Any history of heavy bruising, bleeding problems or a bleeding disorder.
• Other health conditions and recent changes to your medicines.
• What type of hair loss you have been told you have, if known. The NHS suggests seeing a GP about hair loss, including before considering a commercial hair clinic.

Questions to ask:

1. Does anything on my list change whether PRP is suitable for me?
2. Who should decide whether any medicine is paused, and who will I speak to first?
3. What pain relief should I use before and after treatment?
4. Should I keep using my hair-loss medicine, and when?
5. What bleeding, bruising or other effects should prompt me to contact you?

Next step

For background on the treatment, read about PRP for hair loss at Progen and what to expect from PRP hair treatment. If you are unsure your hair change is pattern loss, see hair shedding vs pattern hair loss. If you take regular medicines, ask Progen about a PRP hair consultation and mention them in your first message, but ask how to share your medicines list securely rather than sending detailed medical history through general contact links.

Frequently asked questions

Should I stop my blood thinner before PRP hair treatment?

No. Do not stop or change a prescribed blood thinner on your own. Tell the clinic before booking and ask your prescriber or anticoagulation service. Some clinics treat anticoagulant therapy as unsuitable for PRP, while others involve your doctor in the decision, so the answer depends on the clinic and your circumstances.

Can I take ibuprofen or paracetamol around PRP?

Ask the treating clinic which pain relief it advises. A 2022 systematic review found that aspirin, paracetamol and non-selective NSAIDs reduced platelet aggregation, while COX-2-selective NSAIDs did not, but it did not study hair treatment. Clinic instructions differ and cite no hair-specific evidence.

Do I have to stop minoxidil before PRP?

I did not find evidence that you must stop minoxidil. A 2024 meta-analysis of five trials compared PRP added to minoxidil with minoxidil alone, with low to very low certainty. Ask the clinic whether and when to use it around sessions, and do not change a prescription yourself.

Ask Progen about a PRP hair consultation

Sources and further information

• Kao et al. 2022 (Orthop J Sports Med) systematic review of 20 studies: aspirin and acetaminophen significantly reduced platelet aggregation; NSAIDs only in non-selective formulations; COX-2-selective NSAIDs and statins did not; none significantly reduced platelet count; authors suggest considering suspending aspirin, acetaminophen and non-selective NSAIDs before PRP. Accessed 2 November 2026.
• Frey et al. 2020 systematic review of antiplatelet and NSAID effects on PRP: 8 of 15 studies reported reduced growth factors or mitogenesis; more studies needed. Accessed 2 November 2026.
• Yao et al. 2024 (PLoS One) meta-analysis of five RCTs: PRP plus topical minoxidil gave higher hair density than minoxidil alone at 1, 3 and 5-6 months; adverse event risk comparable; GRADE certainty low to very low; three of five trials high risk of bias. Accessed 2 November 2026.
• Kieling et al. 2024 (An Bras Dermatol) meta-analysis: 13 trials pooled, mean hair-density difference 27.55 hairs/cm2 (95% CI 14.04 to 41.06), highly heterogeneous, low quality, publication bias. Accessed 2 November 2026.
• NHS: anticoagulants may not mix well with ibuprofen; do not take with other NSAIDs such as aspirin; ask a pharmacist or doctor if unsure. Page last reviewed 27 August 2025; accessed 2 November 2026.
• NHS: aspirin may not mix well with anticoagulants or other NSAIDs; bleeding more easily is a common side effect; if you regularly take low-dose aspirin, keep taking it unless advised to stop; tell your doctor about all medicines and supplements. Page last reviewed 3 July 2026; accessed 2 November 2026.
• NHS: minoxidil and finasteride work only while in use; see a GP about hair loss, including before considering a commercial hair clinic; PRP is not mentioned. Page last reviewed 24 January 2024; accessed 2 November 2026.
• SDCEP: dental patients on warfarin with INR below 4 should be treated without interrupting anticoagulant; interruption risks serious thromboembolic event; therapy adjusted by their medical practitioner or anticoagulation service. Accessed 2 November 2026.
• Clinic instruction example: stop ibuprofen, aspirin and naproxen at least one week before treatment. Accessed 2 November 2026.
• Clinic instruction example: NSAIDs ten days; anticoagulation therapy listed as unsuitable; do not stop prescribed medicine without consulting GP. Accessed 2 November 2026.
• Clinic instruction example: avoid NSAIDs a few days before; wait about three days after treatment before minoxidil. Accessed 2 November 2026.
• Clinic instruction example: stop aspirin and ibuprofen at least one week before only with medical doctor approval. Accessed 2 November 2026.