You are correct that typically stand-alone drug plans cannot be changed outside of Annual Enrollment. However, if you are newly eligible for assistance with your drug costs under the Extra Help program because you have a lower income (note: check www.ssa.gov for further information on the Extra Help program for prescription drugs), you could be eligible for a special election to change your drug plan.
If you have not already, you may want to ask your doctor(s) if there are any lower cost comparable prescription drugs for the higher cost drugs you are taking. If you are taking any brand name drugs, you may also want to ask your doctor(s) if they have any samples.
Also, please check to make sure that you are getting your prescription drugs from your plan’s preferred network pharmacy to ensure better pricing as well as check to see if there is any cost savings if you obtain your prescription drugs through your drug plan’s mail order service.