A composition for treating or preventing glaucoma or ocular hypertension including a isopropyl (6-{[4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl}pyridin-2-ylamino)acetate and a beta-receptor antagonist, in a combined pharmaceutically acceptable amount. As for the administration form, these drugs may be administered concomitantly or may be administered as a combination drug.