As it turns out, difficult child did not take that medication last night. I had them out for him in the kitchen and went to bed. He took the clonidine and melatonin only. I had given him Benadryl earlier.
By the time I got up, he was already out of the house and at his girlfriend's house. I texted him and asked about the rash. He texted back that it was not as itchy. I called the psychiatrist. He called back 3 or 4 hrs later, a bit upset (he swore under his breath ... this type of reaction is relatively rare) and said to have the family dr look at the rash to be sure, so I had calls coming and going, and then I had husband stop by the girlfriend's house to look at the rash in person, and difficult child had gone to the mall with-his girlfriend. Didn't tell us, of course.
So we had to trust that he was telling the truth and it is mostly gone, and that he's not just saying that to get out of going to a dr appointment when he'd rather be with-his girlfriend. He can be so aggravating! And after talking to the psychiatrist, it really sent me sky high, panicking.
Meanwhile, I am waiting for the other shoe to drop because difficult child hasn't had any major blowups since he's been off of the lithium, although he has been a bit surly.
I will see him in a little bit. Without his shirt on.