Vilitra 40 mg may still work with low testosterone, but it may be less effective if low testosterone is the main cause of erectile dysfunction  How Vilitra (Vardenafil) Works Vilitra 40 contains vardenafil, a medication that increases blood flow to the penis by relaxing blood vessels. It helps only when sexual stimulation is present.  What Happens with Low Testosterone? Low testosterone can cause: Reduced sex drive (low libido) Poor erections Fatigue Mood changes If low testosterone is the main problem, then PDE5 inhibitors like Vilitra 40 mg may not fully work because the body lacks the hormonal drive needed for arousal and erections.   So Does It Work? Possible Outcomes   it can still work if the erectile dysfunction is mainly due to blood flow issues.   Less effective or not effective if low testosterone is the major cause.  What to Do? If you suspect low testosterone, it’s best to get tested (blood test). If testosterone is low, your doctor may suggest: Testosterone replacement therapy Lifestyle changes Combining therapy with ED medication mportant Safety Note Avoid using Vilitra if you are taking nitrates (like nitroglycerin) or certain heart medications. This combination can dangerously lower blood pressure. If you want, I can help you interpret testosterone test results or suggest what to ask your doctor.