| NAPH | vasoconstrictor (trade names Privine and Sudafed) used in nasal sprays to treat symptoms of nasal congestion and in eyedrops to treat eye irritation |
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| NAPH | any of various volatile flammable liquid hydrocarbon mixtures |
| NAPH | a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs |
| NAPH | toxic condition resulting from inhaling or ingesting naphthalene |
| NAPH | either of two phenols derived from naphthalene |
| NAPH | a fat-soluble vitamin that helps in the clotting of blood |