Sinarest 0.5 mg Nasal Drops acts as a nasal decongestant. It relieves the nasal discomfort associated with hay fever, sinusitis, allergies, and a common cold. It can also be used as an ophthalmic agent to reduce the swelling of the blood vessels in the eyes, thereby temporarily reducing their redness. Use of this medicine in children less than 6 years of age is not recommended unless instructed by the doctor