hi, my dad just got a heart attack 2 months ago. last friday went throught cathaterization and going to PCI next monday. he got some coronary blocked. the last 3 days (today is the 4th day) he got constipation . is it safe for him to take dulcolax suppository ? if not, whats the best medicine? he already eat papayas, jelly, yogurt, and lactulax last night. thank you