Achieving 2nd plat after 1 year no use

Hey I havent used dxm in a year and want to achieve a Mid second plat. Would 4oz Delsym do the trick at 165lbs, not sure if the full 5oz would be a bit overwhelming after so long?

I also got Zofran(serotonin antagonist not agonist not really dangerous), pepto bismol, ginger root and 50mg antihistamine ill be taking with it to quell that dreaded nausea.