Kamagra-FX Oral Jelly 100 mg Sachet 5 gm belongs to the group of medicines called phosphodiesterase type-5 (PDE 5) inhibitors primarily used to treat erectile dysfunction (impotence) in adult men. Additionally, Kamagra-FX Oral Jelly 100 mg Sachet 5 gm may also be used to treat pulmonary arterial hypertension (high blood pressure in the lungs) in adults to improve the ability to exercise and to slow down clinical worsening.