There are pharmacy/pharmacology forums, communities in the web. I would ask this question in those.
Edit: iirc, this member has a degree in pharmacology, maybe he will write you an answer:
https://www.healingwell.com/community/profile.aspx?f=38&m=2917210&p=102876 Or you can send him an email.
You can also write an email to the company that owns pentasa to ask your question.
Post Edited (xy123) : 6/29/2019 11:04:39 AM (GMT-6)