Our Story

We believe in the legitimate medical applications for medical marijuana and are committed to providing the highest quality care in an easy and affordable format. Our physician providers are highly trained and experienced specialists, all registered with the Virginia Board of Health Professions to issue written certifications for medical cannabis use. Our staff is caring and supportive. Our process is easy, safe and private. Together, we have helped thousands of Virginians gain access to the benefits of medical cannabis.

Our Physician Founder

Dr. Nicholas Marsh has been a distinguished board-certified anesthesiologist in Northern Virginia for over 35 years. Recognized as a top doctor by, his vision for providing top-quality medical services is driven by his passion for patient comfort and dignity. 

Dr. Marsh’s enthusiasm for cannabis therapy is fueled by the growing body of scientific evidence, and his personal experiences helping patients, friends and family.  Patient after patient, he and his team have improved the lives of thousands of patients suffering from anxiety, pain, sleep disturbances and many other disabling ailments. He strives to assure each patient in our patient family is cared for personally and compassionately.

When starting the practice in 2021, Dr Marsh dedicated ReThink-Rx to improving the quality of life for those members of society whose lives have been interrupted by disease.

Dr. Nicholas Marsh

Dr. Shaz Anwar brings experience and skills that complement the ReThink-Rx team perfectly. As an Internist and Hospice and Palliative care specialist, he has dedicated his career to providing support and comfort to those in the last stages of life. His compassion for his patients is matched only by his determination to believe the science of medicine. Trained at Lewis Gale Hospital in Blacksburg Virginia and OhioHealth Riverside Methodist Hospital, Columbus, Ohio, Dr. Anwar is a highly respected member of the Northern Virginia medical community.

Dr. Shaz Anwar

EXPERT TESTIMONIAL- JOYCELYN ELDERS MD, FORMER US SURGEON GENERAL, wrote the following in an article titled “Myths About Medical Marijuana,” published in the Providence Journal:
“The evidence is overwhelming that marijuana can relieve certain types of pain, nausea, vomiting and other symptoms caused by such illnesses as multiple sclerosis, cancer and AIDS — or by the harsh drugs sometimes used to treat them. And it can do so with remarkable safety. Indeed, marijuana is less toxic than many of the drugs that physicians prescribe every day.”
Mar. 26, 2004 – Joycelyn Elders, MD