This will vary greatly between practice and protocols. I personally want to encourage my patients who come for PRP to continue with it for the long term and not use it as a one off treatment because it will not provide long term benefit in the latter case. Just like laser therapy or Finasteride, if you stop PRP it will stop working. For this reason in my centers we do not charge by injections, but rather as a monthly membership which can be canceled anytime. We have an initiation fee which we waive for our surgical post ops, and a monthly fee of $399 which can be canceled at any time if the patient chooses to consider an alternate maintenance strategy. We also monitor and track miniaturization for our members with high mag photos every few months to check the effectiveness of the treatment. Good luck to you! Best, Dr. Rome