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Three newly synthesized alkanol esters of d-2-(6-methoxy-2-naphthyl)propionic acid, NAPROXEN were examined for physicochemical properties and biopharmaceutical characteristics. These esters were very stable in solid state, but more than 90% of these esters were hydrolysed to the parent, naproxen in rabbit’s liver homogenates. They showed higher dissolution rate in the artificial gastric and intestinal juice, and significantly greater partition coefficient in n-octanol, when compared with naproxen. The absorption rate constants of these esters were increased, while the elimination rate constants were decreased, comparing with naproxen. The ulcerogenic doses on gastric and intestinal mucosa were increased remarkably, and the antiinflammatory dose against carrageenininduced edema on rat hind paw was decreased markedly in these esters, and thus the safety indexes of these esters were higher than that of naproxen.
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