Deregulation of sale of over-the-counter drugs outside of pharmacies in the Republic of Korea: interrupted-time-series analysis of outpatient visits before and after the policy.

For migraine, an increasing trend was observed before the policy (ß = 0.0057).

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Result For acute upper respiratory infections, monthly outpatient visits showed a decreasing trend before the policy (ß = −0.0003);after it, a prompt change and increasing trend in monthly outpatient visits were observed, but these were non-significant.

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