Illustrations: Leanne Rule

Inside a Facebook ‘Dallas Buyers Club’ for Cat Drugs

Desperate pet owners must either buy illegal medications or watch their cats die

Carrie Arnold
OneZero
Published in
12 min readJul 15, 2020

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A single glance at the foster kitten told veterinarian Jessica Thompson all she needed to know. Harper’s once-velvety gray coat was greasy and dull. She was still small — just five pounds — but her abdomen swelled like she had a baseball in her stomach. In the clinic, Thompson used a syringe to remove cloudy, yellowish fluid from the five-month-old cat. She had seen these symptoms two years before, in two other foster kittens. The disease, known as feline infectious peritonitis, is caused by a mutant form of a common feline virus. It most frequently strikes cats at the beginning and end of their lives, when their immune system is the weakest. Historically, FIP has been 100% fatal.

The family that had begun the process of adopting Harper had already fallen in love with the gray fluffball, and Harper’s new mom broke down at the news.

“At that point, I didn’t care,” said Thompson. “I just wanted to save Harper because I wasn’t going to have another FIP kitten die if I could save its life.”

Thompson knew there was another option, but it was a risky one. Several months before, another family told her of a new drug called GS-441524 that could cure cats…

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Carrie Arnold
OneZero
Writer for

Just your friendly neighborhood public health reporter, covering the intersection of health and environment. Lover of coffee, knitting, cycling, and cats.