Yes, Fildena 100 mg, which contains Sildenafil Citrate (a phosphodiesterase type 5 inhibitor used to treat erectile dysfunction), can potentially cause allergic reactions, though they are relatively rare. Possible allergic reactions to Sildenafil might include:

Rashes: Skin rashes or hives can occur as an allergic response.

Itching: General itching or itching in specific areas.

Swelling: Swelling of the face, lips, tongue, or throat (angioedema), which can be more severe and might require immediate medical attention.

Difficulty Breathing: In rare cases, severe allergic reactions might cause difficulty in breathing or wheezing.

In addition to allergic reactions, some people might experience non-allergic side effects, such as headaches, flushing, upset stomach, or visual disturbances.

If you suspect an allergic reaction to Fildena 100 mg, it’s important to stop taking the medication and seek medical advice immediately. Your healthcare provider can help determine if the reaction is due to the medication or another cause and provide appropriate treatment or alternatives if needed.