I think if you read the side effects of almost any drug, including acetaminophen, they will scare you!
It is important to remember that the pharmaceutical companies try to cover themselves and that most serious side effects are rare.

I was due to have my first Besremi injection last week but it had to be postponed because the drug had not arrived. I shall have the first injection on 5 March.
I found the idea of HU scarier than Besremi.
Happy to hear you are doing well on HU and I hope it continues.