There is medication and then there is drugging up kids. It is important to be leery of just one of those things. The child psychiatrist had that "I've seen this 1000 times look with her', and the medication definitely works. I wish she could be on it all the time, because she is crazy impulsive. Unmedicated, there usually isn't a yes or no, it is a do. On medication, she thinks about yes or no on an action. Without it, not nearly as much. It wears after a while (years).
Don't sweat the speech until 3 years old, of course, read to them a lot and have lots of educational stuff for them to play with, but language can come early or late. And just because they aren't talking doesn't mean they aren't learning.
We've taken language pretty seriously since he was born since I know how critical it is in the early years of their life. We've been reading to him more or less everyday since birth, although it was a bit awkward at the beginning. We've also been adamant about absolutely no screens at any time, as I believe pediatric recommendations say to avoid this until they're four or five. So we're in a situation now where books have become his main form of entertainment, and consequently that's what he wants to do all day. A few weeks ago (while still on mat leave) my wife was getting annoyed because he kept bringing her book after book, all day long.
I did do a bit of research on speech red flags a few months ago, and I believe there were a few indicators for his age. By 15 months he should be using hand gestures, making a variety of sounds, and expressing a few words. He was saying a variant of 'mama' at around 11 months, and he now waves and makes plenty of sound, so it seems like we're on track. The aural issues were a bit worrying if not common, but we're seeing an Audiologist regularly so at least we can track it. Overall I'm not stressing myself over it, just closely watching and making sure we do the right things as time goes by.