Common side effects of Fildena Double 200 mg may include headache, flushing, upset stomach, nasal congestion, dizziness, and vision changes. In rare cases, sildenafil citrate may cause more severe side effects, such as priapism (an erection lasting longer than 4 hours), sudden vision loss, or hearing loss. If you experience any severe side effects, it's important to seek medical attention immediately.
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