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Drug product design of phenylbutazone tablets by direct compressing was investigated. Weight variation, hardness, friability, disintegration time, apparent volume and dissolution rate for experimental tablets of nine formulations which were considered to be the effect of the additive concentration were measured. It was found out that direct compressing by the formulation No. 5 was the most suitable condition (phenylbutazone 16.7%, lactose 25%, calcium phosphate dibasic 15%, Avicel® 41.83% and magnesium stearate 1.5%). The coefficient of correlation between disintegration time and dissolution rate, r, was = -0.97 (P<0.01).
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