Have you been taking the meds for a long time (more than a year?) if so, it's probably not that. Although it could be. Antidepressants, opiate pain killers and blood pressure medications seem to cause the most sexual issues. But, any medication can if you are sensitive enough.
Also, drugs which cause drying of mucous membranes (anything in the atropine family, like Bentyl, or antihistamines) can cause a dry vagina.
May I ask how old you are? If you are in your late 30s to 40s you could be starting perimenopause (some start even earlier) and some women experience dry vagina and problems with arousal. With perimenopause you might be experiencing hot flashes, night sweats, mood swings, erratic or very light or more heavy periods, periods closer together than usual, or skipping periods, along with climax and/or arousal issues.
You may want to see your GYN and try reading erotica, using a good, paraben and glycerine-free lubricant (something from the Sliquid company is my favorite) and have your warm up for sex be very long and give you time to get aroused.
Good luck.
