HOW SUPPLIED. DESCRIPTION: Klonopin is available as scored tablets containing 0.5 mg, 1 mg or 2 mg clonazepam/Roche. Each tablet also contains lactose, magnesium stearate, microcrystalline cellulose and corn starch, with the following dye systems: 0.5 mg-FD&C Yellow No. 6; 1 mg-FD&C Blue No. 1 and FD&C Blue No. 2.Chemically, clonazepam is 5-(2-chlorophenyl)-1,3-dihydro7-nitro-2H-1,4-benzodiazepin-2-one.ach tablet also contains lactose, magnesium stearate, microcrystalline cellulose and corn starch, with the following dye systems: 0.5 mg-FD&C Yellow No. 6; 1 mg-FD&C Blue No. 1 and FD&C Blue No. 2. Chemically, clonazepam is 5-(2-chlorophenyl)-1,3-dihydro7-nitro-2H-1,4-benzodiazepin-2-one.