Make benadryl illegal to buy for kids under the age of 18

My daughter attempted suicide, meanwhile, while she was in the hospital in the ICU I was looking through her phone and saw her looking at benadryl overdose. Many, many kids she saw died from benadryl, so she went and bought bottles of benadryl and took them all. No ID needed, no age limit nothing they just sold it to her which gave her what she was looking for (well, damn near it) and that was death. That being said, I feel like there should be at least an age limit on it, just like spray paint, cigarettes, alcohol or anything else.