You do not have to avoid any activities while taking an angiotensin receptor blocker (ARB). But you should take care when starting any new medicine until you know how it will affect you. Most people have no problems going about their daily routine while taking an ARB.
If a normal activity does make you feel dizzy or lightheaded, lie down. Then, call your doctor.
This can be a sign that your blood pressure is too low. Sometimes your doctor may tell you to take it easy for a little while or to change your diet, fluid intake, or medicine dosage. This can help even out your blood pressure. For most people, the symptoms go away as they get used to the medicine.
Until you know, go slow!