Yes, Zenegra 100 mg, which contains sildenafil citrate, may cause common side effects, similar to other medications in the class of phosphodiesterase type 5 (PDE5) inhibitors. These side effects are usually mild to moderate in nature and may include:

Headache
Flushing (redness or warmth in the face, neck, or chest)
Indigestion or upset stomach
Nasal congestion
Dizziness or lightheadedness
Vision changes, such as blurred vision or changes in color vision
Back pain or muscle pain
These side effects are typically transient and may resolve on their own as the medication is metabolized and cleared from the body. However, if these side effects persist or become bothersome, individuals should consult their healthcare provider.

In addition to these common side effects, sildenafil citrate and other PDE5 inhibitors can cause more serious side effects in some cases, including:

Priapism: An erection that lasts longer than four hours. Priapism requires immediate medical attention to prevent long-term complications such as tissue damage and permanent erectile dysfunction.
Sudden hearing loss or changes in hearing
Sudden vision loss or changes in vision
Allergic reactions, including rash, itching, swelling of the face, lips, or tongue, or difficulty breathing
While common side effects are often manageable and resolve with continued use or adjustments in dosage, individuals experiencing serious side effects should seek prompt medical attention.

It's essential for individuals using Zenegra 100 mg or any other medication containing sildenafil citrate to be aware of these potential side effects and to discuss any concerns with their healthcare provider. Additionally, individuals should follow medical advice and use medications only as directed to ensure safety and effectiveness.