A 25-year-old male presents to the emergency depament with occasional severe headaches, nausea, and vomiting. Blood pressure while sitting is 230/130 mmHg with a hea rate of 90 beats/min but on standing the blood pressure drops to 200/100 mmHg and the hea rate increases to 140 beats/min. A cardiovascular examination depicted tachycardia with normal S1, S2 sounds . The patient’s lungs are clear. The optic discs are blurred, but there are no exudates or hemorrhages. Select appropriate treatment for such condition .