Parents Visiting w/ Medication

I’ve been living in Japan for a couple years now so my parents are planning to come visit me since the borders are open. Both of them are a bit older and they both take a number of medications to maintain their health and well-being. Some of these medications include anti-depressants, pain medication, and blood pressure pills. I remember when I first moved to Japan many of my colleagues had to fill out a Yunyu Kakunin-sho to bring in their medication. Will my parents have to do the same if they will only be staying here for a week and a half. I thought I read somewhere that if their medicine supply is below a month’s worth of medication that they don’t need to fill it out. Is that true? Thank you everyone for the help!