Is there something in psychotropic drugs that attract mosquitoes?

Charlie's current meds:

Carbamazepine 200mg two tablets twice a day
Trazodone HCI 150mg two tablets at bedtime
Mirapex 1mg one half tablet at bedtime
Venlafaxine HCL 75mg one half tablet in the AM and one in the PM
Clonazepam 0.5mg one tablet three times a day

This rainy summer I think I'm spending as much on DEET as I am on drugs and nothing seems to be working to keep the biters away.