Fortisip Compact - Strawberry (4x125ml). Fortisip Compact is a Food for Special Medical Purposes for use under medical supervision. Fortisip Compact is a nutritionally complete, high energy (2.4kcal/ml), ready to drink, milkshake style nutritional supplement, for the dietary management of disease related malnutrition.. Fortisip Compact can be used to supplement the diet of patients unable to meet their nutritional requirements from other foods, or as a sole source of nutrition.