###Human: What are the side effects of Mezol eye drops? ###Assistant: Hi. Mezol (Chlorpheniramine maleate, Methylcellulose, and Nafazoline) has no long-term side effects, but as it contains preservatives, I advise you to use it only when your eyes are red and not on a regular basis. Refresh Liquigel is a lubricant which is preservative free and can be used on a daily basis four times a day. For more information consult an eye care ophthalmologist online -->