A randomized, double-blind clinical trial was conducted on 41 adult patients to compare the efficacy and safety of the combination of terfenadine and pseudoephedrine with that of terfenadine alone. Efficacy of treatment evaluated by the physician and patients showed an excellent rating in 45.45% patients in the combination treatment group compared with an excellent rating in 10.53% in the single treatment group. The difference between both treatments was statistically significant, with a z value of 1.660 (p < 0.05). The combination of terfenadine and pseudoephedrine was found to result in faster relief in a greater number of patients than terfenadine alone. However, both drugs were well tolerated.
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