Opioids 15 year old Roxanol 100 still sealed please read

Hey guys I came across of Roxanol 100 oral solution morphine sulphate its 100mg per 5ml I have a 250 ml bottle. The first time I did some when I broke the seal I did 2.5 ml and I Got the rush morphing gives you and the clear headed clean high affect it usually gives me. The only thing is it made my muscles feel sore. My question is this normal? And also I did 10 ml in two separate sessions the next day and it did my alright but it didn't get me where I thought I would be ano remember 10 ml is 200 mg of morph and it made my muscles soar which morphine never did too me. I will say the the first day it made my legs feel like rubber lol. Anyways do Yall think this stuff is good still and are the feeling I get the norm for high potency morphine?

The rubber legs were always a common side effect with moderate to high dose morphine for me at least.