Vicks Sinex Decongestant Capsules Vicks Sinex Decongestant Capsules are a maximum strength decongestant that provide effective relief from sinus pressure, headaches, nasal & sinus congestion & aches, pains & feverishness. Vicks Sinex Decongestant Capsules are non-drowsy. Directions For oral use. Adults & children over 12 years: 1 capsule to be every 4 hours. Maximum of 4 capsules in any 24 hours. Children under 12 years: Not recommended. Active Ingredients Paracetamol 500mg, Phenylephrine Hydrochloride 12.18mg.