Zhewitra 20 mg is a medication primarily used to treat erectile dysfunction in men. Its active ingredient is Vardenafil, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. While the exact impact of Zhewitra 20 mg on the regulation of intracellular calcium levels isn't fully elucidated, its mechanism of action primarily involves the inhibition of PDE5 enzyme. PDE5 inhibitors like Vardenafil work by blocking the action of the PDE5 enzyme, which is responsible for the degradation of cyclic guanosine monophosphate (cGMP). By inhibiting PDE5, Zhewitra increases the levels of cGMP in smooth muscle cells within the corpus cavernosum of the penis. This leads to relaxation of smooth muscle, vasodilation, and increased blood flow into the penis, resulting in an erection. Intracellular calcium levels play a crucial role in smooth muscle contraction and relaxation. It's possible that the increase in cGMP levels caused by Zhewitra may indirectly affect intracellular calcium levels by influencing calcium channels or calcium-binding proteins involved in smooth muscle function. However, the specific impact of Zhewitra on intracellular calcium regulation hasn't been extensively studied and may require further research for a comprehensive understanding.