A Systematic Review on the Effect of Common Medications on Platelet Count and Function: Which Medications Should Be Stopped Before Getting a Platelet-Rich Plasma Injection?

Kao DS, Zhang SW, Vap AR. Orthop J Sports Med. 2022 Apr 12;10(4):23259671221088820. doi: 10.1177/23259671221088820.

Full Text Freely Available

Take-Home Message

Aspirin, acetaminophen, and nonselective nonsteroidal anti-inflammatory drugs (NSAIDs) may inhibit platelet function. Providers should ask a patient to suspend these medications before a platelet-rich plasma (PRP) injection.


Platelet-rich plasma (PRP) injections contain a patient’s platelets in a small volume of plasma. Clinicians may use PRP to treat various soft tissue injuries and promote healing following certain surgical procedures. The platelets release growth factors and cytokines to encourage a healing response. Although investigators have examined the optimal platelet concentrations and preparation methods, little research exists on how patient-specific factors impact PRP efficacy.  

Study Goal

Kao and colleagues conducted a systematic review to evaluate how common medications affect platelets. The researchers then established guidelines for medications a patient should stop before a PRP injection.


An initial database search yielded 1,711 articles, and 20 articles met all inclusion criteria. Of these 20 studies, 15 were randomized controlled trials, and 5 were cohort studies. Inclusion criteria required that a paper reported on platelet function and at least one common medication (aspirin, acetaminophen, nonselective NSAID, cyclooxygenase 2-selective NSAID, a statin, or gabapentin). Several outcomes for platelet function were assessed, including platelet count, platelet aggregation, and platelet adhesion. No studies with gabapentin met all inclusion criteria.


A total of 792 people (387 male, 194 female, and 211 unspecified) participated in the 20 studies. The age range of the participants was 18 to 88 years old. Furthermore, 449 participants were considered healthy, and 343 reported a chronic condition or history of surgery. Patients taking aspirin, acetaminophen, or nonselective NSAIDs (such as ibuprofen) demonstrated decreased platelet aggregation. Statins and COX-2 selective NSAIDs did not affect platelet aggregation. Aspirin, statins, and NSAIDs had little or no impact on platelet count.


PRP is an effective treatment for many soft tissue injuries. Patient-specific factors, such as medication use, may impact PRP efficacy. These results indicate that providers should suspend aspirin, acetaminophen, and nonselective NSAIDs before a PRP injection. However, if potential risks related to medication suspension exist, patients and clinicians should discuss these risks. This discussion is especially relevant since the authors could only determine if the medications impacted platelets and not if they affected the overall efficacy of PRP.

Clinical Implications

If reasonable, clinicians should advise patients to suspend specific medications before a PRP injection to help improve the efficacy of the treatment.

Questions for Discussion

In your clinical experience, do you or your consulting physician recommend suspending certain medications before a PRP injection? If so, have you noticed a difference in the efficacy of the treatment?

Related Posts

The Positive Effects of Different Platelet-Rich Plasma Methods on Human Muscle, Bone, and Tendon Cells
Platelet-Rich Plasma Falls Short Compared with Exercise Therapy

Written by Rebecca Rodriguez
Reviewed by Jeffrey Driban