I was recently prescribed Opana ER 5mg and I'm kind of wondering if there's a adjustment period when beginning ER medications. I was able to fall asleep okay the first night (no insomnia or sleep paralysis) but I had taken the drug at about 3:15pm. Yesterday I took it at 9:45am and was quite "beyond tired" when I finally laid down to sleep at 10:00pm. I kept feeling like I was getting shocks of electricity in my head. I mean, in general the drug makes me feel a bit tingly when I'm drifting off. These head shocks were quite different, though. I also kind of feel like I'm falling.
Is this a normal reaction to starting a rather potent ER drug? Should these feelings pass, or am I just... odd?
I have no experience with ER drugs. I understand their benefit and while I'm scared of them, I hope they'll be able to help me.