Sildalist Strong 140 mg is marketed as a combination product for erectile dysfunction (ED). Products sold under this name commonly contain sildenafil and tadalafil, two phosphodiesterase type-5 (PDE5) inhibitors, although the exact formulation and strengths may vary by manufacturer and country. Always verify the ingredients on the packaging. Both sildenafil and tadalafil enhance the nitric oxide–cGMP pathway. During sexual stimulation, nitric oxide promotes cGMP production, which relaxes smooth muscle and increases blood flow to the penis.