Hi, Thank you for the query. Usually Flolan is used to treat severe Pulmonary Arterial Hypertension
(PAH). You were right in reading that Flolan takes away the platelets so that blood can't clot inside lung vasculature. When blood clot is formed then platelets are consumed, thereby their number decreased. During Flolan administration blood can't coagulate as it deactivates platelet aggregation, so the platelets remain unconsumed and its number increased. Hope you got the answer.