I would choose a bar Chart, where abscissa reflects the period and the Ordinate lists the meds.
Med1 ¦********************* ******
¦
Med2 ¦ ****** ***********
¦
Med3 ¦ **************************
¦
Time ¦+----+----+----+----+----+----+----+
Aug 1 2 3 4 5 6 7 8