If I’m understanding this correctly:

1 - Thursday, Mar 28

2 - Friday, Mar 29

3 - Saturday, Mar 30

4 - Sunday, Mar 31

5 - Monday, Apr 1

6 - Tuesday, Apr 2

7 - Wednesday, Apr 3

8 - Thursday, Apr 4

9 - Friday, Apr 5

10 - Saturday, Apr 6

If he’s supposed to take ten doses and the first one was Thursday, March 28 then the last one is today, April 6