Filagra is a medication used to treat erectile dysfunction, containing sildenafil citrate, the same active ingredient found in Viagra. Like any medication, Filagra can have potential side effects, including:

1. Headache
2. Flushing (redness and warmth in the face or neck)
3. Indigestion or upset stomach
4. Dizziness or lightheadedness
5. Nasal congestion
6. Vision changes, such as blurred vision or changes in color vision
7. Back pain
8. Muscle pain
9. Nausea
10. Priapism (a prolonged and sometimes painful erection)

These side effects are not experienced by everyone and can vary in severity. It's important to consult a healthcare provider before taking Filagra, especially if you have any underlying health conditions or are taking other medications, as they can interact with sildenafil.
When taking Filagra, one can expect an improvement in erectile function, leading to the ability to achieve and maintain an erection suitable for sexual activity. However, it's essential to note that Filagra, like Viagra, does not cause spontaneous erections; sexual stimulation is still required for it to work effectively. Additionally, the onset and duration of action can vary depending on individual factors, such as metabolism and dosage. It's typically recommended to take Filagra about 30 minutes to an hour before sexual activity for optimal results.