Flarin contains ibuprofen.
Anyone that has had a stroke must see a doctor before taking Flarin. Medicines like ibuprofen may be associated with a small risk of heart attack or stroke, particularly when used at high doses.
Also Flarin may affect or be affected by anti-coagulant blood thinning medicines such as Clopidogrel.
Given your father’s medical history and current medication he must see a doctor or pharmacist before taking Flarin, but I think he is unlikely to be able to use this product (same as any product containing ibuprofen).