Poison Pill


Fiction - Thriller - Medical
383 Pages
Reviewed on 01/29/2026
Buy on Amazon

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    Book Review

Reviewed by Anne-Marie Reynolds for Readers' Favorite

Poison Pill by Anthony Lee is a shocking medical thriller. Dr. Mark Lin hates anything that harms, but he's about to face two of his biggest nemeses: bad herbal supplements and greedy drug companies. A herbal supplement causes a young man's kidneys to fail. Another patient on a weight loss drug suddenly struggles to breathe. When things turn deadly, Mark has no choice but to get involved. His investigations lead him deep into the dark abyss of the pharmaceutical and herbaceutical worlds, where he stumbles on secrets so bad, they can kill. But when he discovers what's really going on, his life is on the line. Can he stop these industries in their tracks?

Poison Pill by Anthony Lee is a stunning read and the third book in the Dr. Mark Lin thriller series. It's a serious eye-opener into what goes on behind closed doors in two industries that claim to be helping people. It's a timely story, given that certain injections and supplements are making headline news. The story draws you in from the start. It's written in the first person and present tense, hard to pull off, but Anthony has done it beautifully. It's engaging, full of suspense, and has enough twists and turns to leave you dizzy. Every chapter ends in a way that makes you want to keep reading, and you will, so be prepared for a late night or two, because you'll be hooked by this story. The characters are likable, and you'll be invested in the main protagonist's story all the way through. Although this is medical fiction, all the medical terms and procedures are clearly explained and easily understandable. All in all, this is an enjoyable read and highly recommended if you love a good thriller with plenty of action.

Lucinda E Clarke

Poison Pill by Anthony Lee is a medical thriller focusing on the dangers and variations of weight loss drugs. Acknowledging that a significant percentage of the population is obese, there is a ready market for medication, anticipating enormous profits. Doctor Mark Lin works in a large hospital in California and encounters several unexplained life-threatening cases among some of his overweight patients. After much investigation, he discovers that two drugs, one herbal and the other a recent mainstream medication approved by the Food and Drug Administration, are a common factor in all the patients. He sets out to discover more information and invites danger from those criminals behind the distribution and hard-selling pharmaceutical representatives. After several deaths, not only of patients but also of those who supply the drugs, his own life is in danger as he gets closer to the truth.

Poison Pill is for fans of stories from the world of medicine. Anthony Lee explains medical facts and procedures that any layman can comprehend, and he also highlights many interesting laws of which I was not aware. I learned a lot from reading this book. While I did not warm to the main character, Dr. Lin, who comes across as rather self-opinionated, I could sense his frustration and determination to discover the truth behind the killer drugs. The pace is not frenetic, but is sufficient to hold the reader’s interest, and there are some nice descriptions of areas along the Pacific coastline in California. The author also uses modern methods of investigation available to everyone. The storyline is believable and may serve as a warning to the public of the dangers of purchasing drugs over the internet. A satisfying read.

Asher Syed

Dr. Mark Lin sees a significant change in his routine after several patients present with severe organ failure, linked to their use of weight loss products, in Anthony Lee’s Poison Pill. When similar patterns reach his own family, Mark steps outside standard practice to track how a herbal supplement called Motileaf and a prescription drug called Naxipil go from production to patient. His search follows supply routes through clinics, shops, distributors, and manufacturers while he balances his hospital duties and care for his father after a sudden medical crisis. As the evidence accumulates, the inquiry draws attention from people invested in keeping the products moving. Pressure replaces cooperation. Risk enters his daily life. The book follows Mark’s effort to determine what is being sold, how it is altered, and who benefits in medicine, culminating in a massive climax when Mark finds himself in direct confrontation with the operators behind the scheme.

Anthony Lee’s Poison Pill is a medical thriller that leans into the merging of hospital medicine and pharmaceutical oversight, all through Mark, who is faced with a new type of trouble inside everyday clinical practice. Lee provides heaps of suspense, like a dialysis admission that triggers concern about a herbal supplement, and a covert factory visit where an unexpected action signals systemic corruption. Mark is a perfect blend of bedside manner, persistence with regulators, and loyalty to patients, and he is someone we really do want to root for. Aside from just being a good guy, he has so much thrown on him from so many angles that it feels a little personal. I actually started to really care about Mark. I love the settings, which Lee writes with tactile and visual detail, whether it is crowded wards, conference halls, or manufacturing floors. The best bit is reserved for a spectacular ending that ticks all the thriller boxes, and overall, this is a doctor with the potential to branch into a true series. One can hope, right? Very highly recommended.

Frank Mutuma

In Poison Pill by Anthony Lee, Mark is a hardworking doctor at Ivory Memorial Hospital who is willing to go the extra mile for the well-being of his patients. The case of Hector, who has kidney failure at a young age, highly disturbs him after he finds out about the young man’s use of a herbal product called Motileaf. Mark is also concerned about another patient called Robbie, whose current symptoms only began after using Naxipil, which he learns is being pushed by a pharmaceutical company willing to bribe doctors to prescribe it to their patients. As events unfold, Lanh Vo, who has peripheral arterial disease and other complications, happens to be using Motileaf, which Mark is investigating. How will things unfold as Mark's father suffers a heart attack and stroke, which increases Mark's determination to expose the companies involved?

As a medic, I related quite strongly to Poison Pill by Anthony Lee. I was hooked from the first page to the last, and once I started reading, there was no putting it down. This thought-provoking work highlights the dire need for putting in strong measures to protect patients from pharmaceutical and herbal companies. I was impressed by the accuracy of the medical terminology and procedures, which shows the author's research in writing the book. This amazing work also reminds medics of ethics, which they might have forgotten over the years, and the solemn oath they took to do no harm. The characters were well-developed, and the reader will also appreciate the excellent narration, which adds to the overall beauty of the work. I look forward to reading something else by this talented author.

Alma Boucher

Poison Pill is an outstanding medical thriller by Anthony Lee. Dr. Mark Lin is disturbed by an unsettling coincidence with patients. Two young patients were admitted to the hospital with mysterious and alarming symptoms. Both patients are using a new herbal supplement that promotes weight loss and boosts energy. The situation grows more troubling when Mark learns that one of his patients and his sister’s parents had taken Motileaf for some time before their sudden deaths. Mark cannot ignore this coincidence and investigates to find some evidence. Mark is up against people willing to hide the truth at any cost, and his investigation takes him into a maze of aggressive sales reps. Caught between professional responsibility and personal doubt, Mark is determined to expose the truth.

Poison Pill by Anthony Lee is an intense thriller with medical terms even I could understand. The story is fast-paced with enough action to grab my attention from start to finish. Medical ethics, consumer vulnerability, and profit over patient safety themes run throughout the story, and this made me wonder if it is safe for me to put my trust in these industries. I was on the edge of my seat as Mark uncovered disturbing truths, and I was kept guessing as to where this would lead. The vivid descriptions of symptoms and clinical procedures created an immersive read for me. Mark is my favorite character. He transforms from a dedicated physician into an investigator. Mark reflects the emotional toll of practicing medicine in a world of profit-driven health trends. The book is well written and had me hooked. I enjoyed reading this thought-provoking story.