The use of D&B is generally relatively safe for about 10 days, but it varies from person to person for several reasons: First, D&B is an eye drop that contains dexamethasone among its ingredients, which is a hormone. Although it is a topical drug, you should also pay attention to the adverse effects of hormones, so it is not suitable for long-term use. Second, the intraocular pressure should generally be monitored about 10 days after use, including children with difficulties in intraocular pressure measurement and uncooperative patients, and should be routinely monitored and reviewed regularly at the hospital, so that the doctor can decide whether you can continue to apply it. Thirdly, it is also important to note that DYNAMICS eye drops should be discarded after four weeks of opening, as it is possible that the solution may be contaminated after a period of opening, which is also not conducive to the safety of the medication. It is also important to note that pregnant and lactating women are special medications and should always be used under the guidance of a doctor.