I’ve taken Effexor XR for over 25 years and only recently my sleep apnea doc suggested I stop or reduce the amount (300 mg once/day). Why should I do this. Doc wasn’t clear about why. I’m doing ok on the 300mg. My shrink prescribed it over 25 years ago for long time PTSD, which I still have, although I haven’t seen the shrink in over 20 years. Any info anyone has will be appreciated. Thank you.