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When comparing Fildena 50 and Cialis (which contains tadalafil), both medications are used to treat erectile dysfunction (ED), but they have distinct differences in user experience and satisfaction. Here's a detailed comparison based on various factors: 1. Active Ingredients and Mechanism of Action Fildena 50: Contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor. It works by increasing blood flow to the penis, helping achieve and maintain an erection. Cialis: Contains tadalafil, also a PDE5 inhibitor, but with a different chemical structure. It has a longer duration of action compared to sildenafil. 2. Onset of Action Fildena 50: Typically starts working within 30 to 60 minutes after ingestion. It is recommended to take it about an hour before planned sexual activity. Cialis: Can start working within 30 minutes, but its effectiveness can last up to 36 hours, earning it the nickname "the weekend pill." 3. Duration of Effectiveness Fildena 50: Provides effective results for about 4 to 6 hours, which is suitable for more spontaneous sexual activity within that window. Cialis: Offers a longer duration of up to 36 hours, providing more flexibility for spontaneous sexual activity over a longer period. 4. Dosage and Flexibility Fildena 50: Commonly available in doses of 25 mg, 50 mg, and 100 mg. It requires timing and planning to coincide with sexual activity. Cialis: Available in doses of 2.5 mg, 5 mg, 10 mg, and 20 mg. The lower doses (2.5 mg and 5 mg) are often used for daily use, allowing for greater spontaneity and flexibility. 5. Side Effects Fildena 50: Common side effects include headaches, flushing, nasal congestion, indigestion, and dizziness. These effects generally subside after a few hours. Cialis: Common side effects include headaches, back pain, muscle aches, nasal congestion, and flushing. The longer duration can sometimes lead to more prolonged side effects.