About Us


Our Mission


“Create a new standard of patient care in psychiatry that is based on objective data and clear science.”

Personalized Prescribing is committed to developing world-leading pharmacogenetic algorithms and technology that will ensure each individual can receive the right antidepressant, in the right dose, without suffering through months and, often years, of drug failure and unnecessary side effects, all conducted directly with patients by knowledgeable psycho-pharmacists.


Our Story

How it started

Our founder, Mark Faiz, experienced a turning point in his life 30 years ago when a very good friend’s life completely unravelled due to a mental health condition. Mark was left frustrated, bewildered and feeling helpless. This began his 20-year journey of self-education, which convinced him that mental illness is no different from other health conditions, except that it is an ailment of the brain, the most complex organ.

In 2014, Mark and two genetic scientists started a pharmacogenetic testing company. However, by 2017 Mark started realizing that the genetic testing they were doing, while effective for other conditions, was not effective for mental health patients. So, Mark left to focus solely on figuring out how to help people with mental illness.

Since 2018, Mark and his team have been working on “second-generation pharmacogenetics” that investigates not only metabolic genes but also brain receptors (the target for medication) and the interactivity or “pathways” between them. In fact, they’ve developed proprietary algorithms that map the pathways for the various genes and drugs.

The other issue Mark wanted to address with this new company was the frustration patients felt when they were left to interpret long reports with no specific drug recommendations. That’s why Mark decided to invest in hiring and training pharmacists.

Today, only Personalized Prescribing provides “second generation” pharmacogenetic testing and assigns a pharmacist to each patient. They speak to them prior to testing, walk them through the results, explain why their meds aren’t working and what they should be taking, and are available to speak to the patient’s health professional.

They have been recognized by both doctors and major benefit providers, but most of all, by their happy patients. Mark and the team pride themselves on their 5-star Google reviews, but more than anything, they simply love hearing how relieved and thankful their patients are. They’ll tell you, “There is no better job.”

Our Team

Our Founder

Mark Faiz

Mark Faiz

Founder, President and CEO

Mark is an engineer and a mathematician by training. He’s applied his thirst for solving challenges in a systematic, analytical way to his passion for helping people suffering unnecessarily from anxiety and depression.

Mark has stubbornly built Personalized Prescribing Inc. with the simple mandate of doing whatever it takes to address this challenge effectively. He believes that if you fix the problem, you will have happy clients, and they will ensure you have a viable business. Mark’s patient-first philosophy is enthusiastically shared by the whole team.

Sanjida Ahmed

Sanjida Ahmed

Chief Compliance and Operations Officer

Abeer Sakheja

Chief Financial Officer

David Rajczak

David Rajczak

Director of Sales & Business Development

Our Psycho-Pharmacists

Our outstanding team of pharmacists strive to provide patient-centred care that is tailored to the unique needs of each individual.

By optimizing medication therapy and providing ongoing support and education, they help patients achieve better health outcomes and improve their overall quality of life.

Sandra Hanna

Sandra Hanna

Lead Clinical Pharmacist

Cindy Hsieh

Cindy Hsieh

Clinical Pharmacist

Sara Temkit

Sara Temkit

Clinical Pharmacist

Christine Mahrous

Christine Mahrous

Clinical Pharmacist

What our patients say about us!

Posted on Google Google
Sara Kovick profile picture
Sara Kovick
Google star 1Google star 2Google star 3Google star 4Google star 5
Responded to me so quickly, and I was able to set up a meeting with one of their pharmacists at a time that worked well for my schedule - which tends to not be the easiest process usually. Their pharmacist was beyond helpful and answered all of my questions thoroughly. It took me awhile to find a company/organization willing to sit down and answer my somewhat random questions, but Personalized Prescribing didn't hesitate and also seemed to be extremely informed on the topic.
Posted on Google Google
Emmanuelle Couture profile picture
Emmanuelle Couture
Google star 1Google star 2Google star 3Google star 4Google star 5
Ce service était proposé par notre compagnie d'assurance. Nous sommes très satisfaits du service reçu et les résultats démontraient clairement que le médicament proposé n'était pas adapté, et qu'une meilleure solution existait! Je recommande très fortement!!!! À noter que je n'ai pas essayé d'autres compagnies similaires.
Posted on Google Google
Edward Bose profile picture
Edward Bose
Google star 1Google star 2Google star 3Google star 4Google star 5
My experience with Personalized Prescribing has been incredible. I'm not at the finish line yet but I'm much further than I would be anywhere else. Most doctors and specialists have no idea what they're talking about. I've been working with Cindy Hsieh to find the best solution for me. She's been incredible. If I need help, she calls me on the same day and answers all my questions. She is extremely knowledgeable and has made this journey much smoother. I highly recommend!
Posted on Google Google
Andrea Withers profile picture
Andrea Withers
Google star 1Google star 2Google star 3Google star 4Google star 5
After over 2yrs of trying various medications we decided to try the Pharmacogenomic testing. From the initial phone call to the test results feedback, we were very impressed with the service, the pharmacist Sara was incredibly helpful and explained everything. The test was easy to do and the full report was incredibly thorough. We felt like we had more information than any doctor appts and now have more of a sense of what to try and how our child's brain reacts to meds. Thankyou 🙂
Posted on Google Google
Angela Marion profile picture
Angela Marion
Google star 1Google star 2Google star 3Google star 4Google star 5
I was very impressed with the informative final medical prescription report I received and the support received by Sandra Hanna, Lead Clinical Pharmacist! Sandra was extremely professional, patient, compassionate, knowledgeable and prompt with every reply! It was a refreshing experience to have excellent service - especially when it’s about one’s health! Thank you so much!!!
Posted on Google Google
Jane Wardell profile picture
Jane Wardell
Google star 1Google star 2Google star 3Google star 4Google star 5
Having the pharmacogenetics test has been invaluable for myself and my family. It takes the guesswork out of which medications will provide the best efficacy for minimal side effects and which provide best outcomes. Additionally, finding out certain genetic information has been interesting and explained why certain medications in the past have not been as effective. It's also nice knowing that the final results are helpful for a lifetime.
Posted on Google Google
StormyTan27 profile picture
StormyTan27
Google star 1Google star 2Google star 3Google star 4Google star 5
I’ve used the service for both me and my daughter and we are very satisfied. I have adhd and been struggling with my medication for a while. With the result, I’ve found the right molecule that works for me. I encourage everyone to use this service!
Posted on Google Google
Jodi Evans profile picture
Jodi Evans
Google star 1Google star 2Google star 3Google star 4Google star 5
We had the pharmacogenetic testing done for our 10 year old son. The head pharmacist (Sara Temkit) was absolutely fantastic. She was more knowledgeable about all the various ADHD medication options than any health provider I have spoken with in the past 3 years. I feel much more educated and aware of the type of medication to best support my son. We are taking him off a stimulant (Vyvanse) and will be using the recommendation Sara put forward. I feel a huge sense of hope and relief after going through this process and would highly recommend it for anyone going on or already on ADHD medication.
Posted on Google Google
Kristine Constantin profile picture
Kristine Constantin
Google star 1Google star 2Google star 3Google star 4Google star 5
For 35 years of feeling that doctors didn't believe me when I said and had tried most antidepressant medication and nothing was helping. I lost faith in myself and felt no hope. Very thankful that my benefit company had sent in a referral to PPI on my behalf. Thanks to the Pharmacogenetic testing and pharmacist Sandra,I now know what will work best for me. Words cannot describe the relief and help I have recieved from them. If you struggle with finding the right mental health medication for yourself than I would highly recommend testing thru Personalized Prescribing Inc.
Posted on Google Google
Kyla Bloch profile picture
Kyla Bloch
Google star 1Google star 2Google star 3Google star 4Google star 5
I really can't say enough about Sandra and the team at Personalized Prescribing. Every interaction I've had with them has been nothing but compassionate and caring. Our daughter had been suffering for years trying different medications - nothing was working and the side effects of the drugs were compounding her already difficult health situation. We would never have tried the drug that was recommended as a result of her Personalized Prescribing test, as it is not on the 'list' of medications typically prescribed for her diagnosis. It's been almost a year now that she has been taking this new drug and she is feeling so much better and is able to enjoy life like she hadn't been able to before. We are so thankful.

Read also Our Stories of Success

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