SINUCON IS AN OVER THE COUNTER PILL I HAD A BAD EXPERICENCE WITH.AFTER TAKING A DOSE OF 2 PILLS IN THE MORNING I FELT VERY DROWSY BUT THE SINUS CLEARED AS I SLEPT. NIGHT TIME I TOOK A DOSE OF 1 PILL,AN HOUR LATER I WAS WOKENUP MY A FEELING OF ITCHING AND BURNING ALL OVER MY SKIN ,I TOOK SOME ANTIHISTAMINE AND THE ALLERGIC REACTION STOPPED. I DO NOT THINK I WILL USE THIS PRODUCT AGAIN, I SUGGEST IT IS SOLD WITH A DOCTOR'S PRESCRIPTION NOT OVER THE COUNTER.