AN OBJECT OF THE PRESENT INVENTION IS TO FIND WHICH OF AN ENORMOUS NUMBER OF PYRIDYLAMINOACETIC ACID COMPOUNDS HAS A PARTICULARLY EXCELLENT INTRAOCULAR PRESSURE LOWERING EFFECT AND MAY BE USED AS A THERAPEUTIC OR PREVENTIVE AGENT FOR GLAUCOMA OR OCULAR HYPERTENSION OR AN INTRAOCULAR PRESSURE LOWERING AGENT, AND TO FIND HOW THE FOUND COMPOUND IS USED AND/OR WHAT DOSE OF THE COMPOUND IS INSTILLED TO A PATIENT (MAINLY, A HUMAN) IN ORDER TO ACHIEVE AN EFFECTIVE THERAPEUTIC OR PREVENTIVE EFFECT. PROVIDED IS A PHARMACEUTICAL PREPARATION FOR TREATMENT OR PREVENTION OF GLAUCOMA OR OCULAR HYPERTENSION, COMPRISING 0.0003 TO 0.01% (W/V) OF ISOPROPYL (6—{ [4—(PYRAZOL—1—YL)BENZYL] (PYRIDIN-3-YLSULFONYL) AMINOMETHYL }PYRIDIN-2-YLAMINO) ACETATE, OR A SALT THEREOF. [NO AVAILABLE FIGURE]