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You might experience some mild side effects such as dizziness, headache, flushing, or an upset stomach. These are common and typically not a cause for concern. Vision changes like increased sensitivity to light, blurred vision, or difficulty distinguishing blue and green colors may also occur. If these persist or worsen, it's advisable to consult a healthcare professional. To minimize dizziness and lightheadedness, try to rise slowly from sitting or lying down.

While most people do not experience severe side effects, it's important to be aware of them. During sexual activity, especially if you have heart issues, watch for severe dizziness, fainting, chest, jaw, or left arm pain, and nausea. Seek immediate medical attention if these occur. Rarely, sudden vision loss or blindness (NAION) can happen, particularly if you have risk factors like heart disease or diabetes. Similarly, sudden hearing loss, possibly with ringing in the ears and dizziness, is a serious concern that requires stopping the medication and seeking medical help.

In rare cases, a painful or prolonged erection lasting four hours or more can occur, which is a medical emergency. Additionally, although uncommon, allergic reactions might happen, presenting as rash, itching, swelling, severe dizziness, or breathing difficulties. Immediate medical attention is necessary for any of these serious side effects. Always communicate any unlisted or concerning effects to your healthcare provider for guidance.