What Are The Side Effects Of Taking Clonazepam?

I AM NOT GETTING SLEEP IN THE NIGHT SINCE LAST ONE MONTH. I HAD SHOWN TO AN MBBS PRACTITIONER AND WAS GIVEN CLONAZEPAM. TILL THE TIME I TAKE THE MEDICINE I GET SLEEP OTHERWISE NOT. KINDLY LET ME KNOW ABOUT THE SAFETY OF THE DRUG/ HOW LONG CAN I TAKE IT SAFELY? ANY ALTERNATIVE OR ADDITIONAL MEDICINE REQUIRED OR NOT. HOW LONG SHOULD I CONTINUE THE TREATMENT.