Bedikot and Vaginal suppositories

Hi,

If a woman needs to take medicine via vaginal suppositories, but she also needs to count her seven clean days to end a niddah period, then she should first do her hefsek taharah and first day's checking, then use the suppositories. She may skip her bedikos (internal checks) for Days 2 through 6 in order to avoid interfering with her medicine, but she would need to skip the suppository on Day 7 in order to do the required checking internally.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:105:4)

Have a great day,
Mordechai