How to Use Use only as directed by your physician. Dosage: Usually 1 tablet (100 mcg) once or twice daily depending on the condition. Hypertension: Start with a lower dose (typically 0.1mg at bedtime), and gradually increase. ADHD/Anxiety: Dose varies by patient and age; always consult a doctor. Swallow with water. Do not crush or chew. Take with or without food, preferably at the same time daily.