Actress Sarah Jessica Parker is ending her relationship with pharmaceutical giant Mylan and speaking out against how the company jacked the price of EpiPens to more than $600 each.

She announced that she has cut ties due to the price hikes in a Thursday statement on Instagram. Parker had been involved with an unbranded Mylan ad campaign about anaphylaxis, as her son has a severe peanut allergy.

“I’m left disappointed, saddened and deeply concerned by Mylan’s actions,” Parker wrote in the statement. “I hope they…will take swift action to lower the cost to be more affordable for whom it is a life-saving necessity.”

On Thursday, Mylan had announced that it would expand its patient-assistance program to reduce costs for people who couldn’t afford EpiPens. The move came after Democratic presidential nominee Hillary Clinton spoke against the price hike and its stock plummeted Wednesday.

The Leadership Brief. Conversations with the most influential leaders in business and tech. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Julia Zorthian at julia.zorthian@time.com.