The red Viagra pill, often referring to high-dose Sildenafil Citrate tablets like Cenforce 150 mg or 200 mg, is used to treat erectile dysfunction (ED) in men. Its primary purpose is to help men achieve and maintain a firm erection by improving blood flow to the penile region during sexual stimulation. It is especially useful for individuals who do not respond adequately to lower doses of ED medication. The red color is typically just for branding or identification purposes and does not affect its function.