Malegra 25 mg contains sildenafil, which is primarily used to treat erectile dysfunction and pulmonary arterial hypertension (PAH). However, the 25 mg dosage is typically used for erectile dysfunction rather than PAH. Studies have shown that higher doses of sildenafil (typically 20 mg three times daily or 40 mg three times daily) are more effective for treating PAH. As for Malegra 25 mg specifically, there might not be studies specifically focusing on the 25 mg dosage for PAH treatment. However, studies on sildenafil's effectiveness in treating PAH might provide insights into its efficacy at lower doses. It's important to consult with a healthcare provider before using Malegra or any medication for the treatment of pulmonary hypertension. They can provide guidance on dosage, potential side effects, and whether Malegra or another medication is the appropriate choice for your condition.