Reference:
1. Naphcon-A. Product information (Concise Prescribing Info. https://www.mims.com/thailand/drug/info/naphazoline%20+%20pheniramine
2. Who should not take Naphcon-A Drops? https://www.webmd.com/drugs/2/drug-8560/naphcon-a-ophthalmic-eye/details/list-contraindications
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