The card does not describe the method of use: it has no number of bags, brewing time or scheme; the aim of weight control is not confirmed. It calls the product a food supplement and lists the contraindications: pregnancy, breastfeeding, individual intolerance of the ingredients. See the instructions on the packaging.
General information (not a manufacturer's instruction): green tea contains caffeine; in case of illness and the use of medicines it is worth consulting a doctor.