Zudena 100 mg contains Udenafil, a medication used to treat erectile dysfunction (ED) in men. Udenafil works similarly to other PDE5 inhibitors like Sildenafil (Viagra), Tadalafil (Cialis), and Vardenafil (Levitra) by increasing blood flow to the penis to help men achieve and maintain an erection during sexual stimulation. If you're looking for alternative medications that compare to Zudena 100 mg here are some commonly prescribed PDE5 inhibitors that work similarly: 1. Sildenafil (Viagra) Brand Name: Viagra Dosage: Typically available in 25 mg, 50 mg, and 100 mg tablets. How it Works: Sildenafil increases blood flow to the penis by inhibiting the enzyme PDE5, which normally breaks down cGMP (a molecule that helps relax smooth muscle and increase blood flow). Onset: Takes about 30–60 minutes to start working. Duration: Lasts around 4-6 hours. Comparison: Sildenafil is the most well-known ED medication and is very similar to Udenafil in terms of effectiveness and mechanism. It has a shorter duration of action than Tadalafil but is effective for most users. 2. Tadalafil (Cialis) Brand Name: Cialis Dosage: Available in 2.5 mg, 5 mg, 10 mg, and 20 mg tablets. How it Works: Tadalafil is also a PDE5 inhibitor but has a longer half-life, allowing for a longer duration of action. Onset: Takes 30 minutes to 1 hour to work. Duration: Lasts up to 36 hours, which is why it's often called the "weekend pill." Comparison: Tadalafil lasts much longer than Udenafil and provides more flexibility in terms of timing for sexual activity. It’s a good alternative if you prefer a longer-lasting effect for spontaneity. 3. Vardenafil (Levitra, Staxyn) Brand Name: Levitra, Staxyn Dosage: Available in 5 mg, 10 mg, and 20 mg doses. Staxyn (the orally disintegrating tablet form) is available in 10 mg. How it Works: Vardenafil works similarly to Sildenafil, but it may have a slightly faster onset and is less affected by food. Onset: Takes about 30–60 minutes to work. Duration: Lasts for 4–6 hours. Comparison: Vardenafil is similar to Sildenafil in terms of duration and effectiveness but may work slightly faster in some people.