Does D-Amphetamine Capsule Help In Reducing Tiredness And Gain Energy?

HI AM BRYNDA MY DOCTOR GAVE ME D-AMPHETAMINE SALT COM XR 30MG CAPS. I TALK TO HIM AND TOLD HIM I WAS TIER ALL THE TIME EVEN WHEN I GET PLENTY OF REST. I NEEDED SOMETHING TO GET ME OUT OF BED AND GET TO WORK! CAUSE I BEEN CALLING OFF TO MUCH. HE SAY THIS WAS SORT OF LIKE SPEED BUT ITS LEGALY. IT WOULD GIVE ME ENGERY. AM AFRIAD TO TAKE IT AFTER I PICK IT UP. TELL ME WHAT IT REALLY IS PLEASE.