Evaluation of drug interaction of glimepiride with phosphodiesterase inhibitors type V in diabetic nephropathy.

The present study investigate the drug interaction of Glimepiride (GLIM) with Sildenafil Citrate (SIL) in Diabetic Nephropathy (DN) rats. Diabetes was induced in rats by administering Streptozotacin i. e. STZ (60 mg/kg). In present investigation GLIM (0.5 mg/kg, P.O.) and SIL (2.5 mg/kg, P.O.) were given for 6 weeks after the confirmation of DN. Pharmacodynamic and kinetic parameters were estimated after 1(st) dose and at the end of 6(th) week of drug administration. There was significant (p<0.001) increase in the bioavailability of GLIM in the presence of SIL in DN after the 1(st) dose of administration of the drug as compared to GLIM treated rat, whereas at the end of 6(th) week of drug administration, there were significant (p<0.0001) decrease in the bioavailability of GLIM+SIL treated DN rats compared to GLIM treated rats. There was significant (P<0.01) reduction of blood glucose level in GLIM+SIL treated group as compare to only GLIM treated group on 1(st) dose of drug administration but after continuous treatment for next 6 weeks, GLIM treated group showed significant hypoglycemia which was found to be reduced in GLIM+SIL treated group significantly. The present study concluded that GLIM+SIL treatment reduces the hypoglycemic condition which was there for GLIM treated DN rat.