Usually a Psychiatrist does not make that kind of mistake on accident but I find it weird that he/she would not first talk to you about the change and their reasons why. But on to your questions...
First off, I’ve been taking Adderall for the past 10+ years, have had my bad experiences and my good experiences. I have let the medicine put me at rock bottom, lead me to severe depression, and a lack of will to live. I’ve also had my share of my own ‘Golden days’ on adderall, so to speak. It is a drug which can bring you down to Earth or it can take you to the stars in a sense. Now, your questions..
-How long does it take for it to take effect? A.- It generally takes about the same amount of time that the IR would take. About 40-45 minutes.
-How many hours does adderall 15mg XR last for? A.- This will depend on how much you’ve taken the drug in the past week, give or take a day or two. Say if you’re used to taking a 30 MG IR everyday then chances are you might barely feel this 15 MG XR. But for the sake of the argument let’s say you’ve never had a adderall a day in your life.. One 15MG XR adderall would probably last you about 8-10 hours, the higher MGs you take, the longer you can expect the results to have effect. But keep in mind you won’t feel the adderall the entire 8-10 hours. It likes to fade in and out. You’ll feel the effects for maybe an hour after it kicks in and then it will fade and soon after the effects will rise up again. Off and on again, over and over until depleted.
-Is the XR come down any different (easier or worse) than IR? A.-In my experience, Most Definitly worse. Because the adderall is XR it will keep coming on and fading off repeatedly until the effects are gone completely, and you can expect mild to severe down comes, depending on how much you’ve taken all together from beginning to end of first daily dosage. I believe it is a worse come down because the XR lasts longer in your system and takes more time to dissolve completely throughout your body.
-Should I switch back if I don’t need it to last as long? A.- Yes, you’d probably be better off doing that either way. If you don’t want your adderall IR to last so long, simply don’t take that much of a MG, just break your pill in half by simply placing both your index and middle finger on both sides of the pill at once and push down, the pill will split evenly. And if you feel that the half of the adderall IR was not enough for the day, take the other half when you’re feeling low. Your psychiatrist will most definitly switch you back If you explain the unwanted effects of the XR. Without a doubt.
I hope I helped you in your search for answers about Adderall XR.