What are the indications and side effects of Sildenafil tablets?

Generally speaking, Sildenafil tablets refer to Sildenafil Citrate tablets. The therapeutic effects of Sildenafil Citrate tablets include improving erectile function, treating pulmonary arterial hypertension, increasing penile blood flow, improving vascular endothelial function, and treating high-altitude pulmonary edema. Side effects of Sildenafil Citrate tablets include headache, facial flushing, visual disturbances, indigestion, and nasal congestion. If this medication is needed, it is recommended to use it under medical supervision. Detailed explanations are as follows:

I. Indications

1. Improving Erectile Function

This medication works by inhibiting the activity of phosphodiesterase type 5 (PDE5), thereby increasing the release of nitric oxide in the corpus cavernosum of the penis. This causes relaxation of the smooth muscle in the corpus cavernosum, allowing blood to flow into the penis and helping men achieve and maintain an erection during sexual stimulation, thus addressing difficulties in achieving erection.

2. Treating Pulmonary Arterial Hypertension

In addition to treating erectile dysfunction, Sildenafil Citrate tablets can also be used to treat pulmonary arterial hypertension. It helps dilate the pulmonary arteries, reduce pulmonary arterial pressure, increase pulmonary blood perfusion, improve cardiopulmonary function, and enhance patients' exercise tolerance and quality of life.

3. Increasing Penile Blood Flow

Sildenafil Citrate specifically acts on the vascular smooth muscle of the penile corpus cavernosum, causing vasodilation of the corpus cavernosum and increasing blood perfusion, thereby resulting in firmer erections and improved blood supply to the penis.

4. Improving Vascular Endothelial Function

To some extent, Sildenafil Citrate can improve vascular endothelial cell function, helping regulate vascular dilation and constriction, which benefits overall vascular health, not limited only to local penile vessels.

5. Treating High-Altitude Pulmonary Edema

In high-altitude environments, some individuals may develop high-altitude pulmonary edema, which can affect health and even be life-threatening. Sildenafil Citrate can dilate blood vessels, reduce pulmonary vascular resistance, alleviate symptoms of pulmonary edema, help patients relieve their condition, and adapt to high-altitude environments.

II. Side Effects

1. Headache

Sildenafil Citrate may cause cerebral vasodilation and alter intracranial vascular pressure, leading to headache, usually mild to moderate. Some patients may require analgesics for relief.

2. Facial Flushing

The medication may act on peripheral blood vessels, causing facial vasodilation, resulting in redness and warmth of the facial skin. This usually occurs shortly after administration and may last for several hours.

3. Visual Disturbances

Sildenafil Citrate may inhibit the PDE6 enzyme in the retina, leading to blurred vision or color vision abnormalities, such as seeing objects with a blue tint or reduced color discrimination ability. However, these effects are usually temporary and resolve gradually after discontinuation.

4. Indigestion

This medication may affect the smooth muscles of the gastrointestinal tract, potentially interfering with normal gastrointestinal motility and digestive function, affecting appetite and digestion and absorption, leading to symptoms of indigestion such as stomach discomfort, nausea, vomiting, and diarrhea.

5. Nasal Congestion

Sildenafil Citrate may cause vasodilation in the nasal cavity, leading to nasal mucosal congestion and symptoms of nasal blockage, causing breathing difficulties that may affect sleep quality and daily life, especially shortly after administration.

When taking Sildenafil Citrate tablets, avoid concurrent use with nitrate medications, as their combination may lead to severe hypotension and even be life-threatening. If you are taking other medications, inform your doctor to allow assessment of the risk of drug interactions.