Yes, that is the cheapest way for him to stay healthy and alive.
Oliver Sherwood is afflicted with pulmonary hypertension (PH), a rare heart and lung condition that causes chronic high blood pressure. Generally this disease affects middle-aged women and the survival time span for these patients is 5 years. There are other ways to handle this disease of course, but Viagara is the cheapest way out.
PH causes the blood pressure in the arteries in the lungs to rise, putting strain on the heart and reducing blood oxygen levels. He can’t walk more than a few steps without getting out of breath and a simple chest infection could kill him.