Levobunolol belongs to the beta blocker class of medicines. It is used alone or in combination with other drugs to treat excessive intraocular pressure caused by glaucoma or other eye illnesses such as ocular hypertension. Lowering excessive intraocular pressure helps to avoid blindness. Levobunolol is available as an eye drop solution that is normally administered once or twice a day. Do not use it while wearing soft contact lenses or else it could permanently stain the lenses. Common side effects of levobunolol may include mild burning, stinging, or eye discomfort, feeling like something is in your eye, blurred vision, dizziness, weakness, headache, rash, or itching.