Sildenafil Oral Jelly 100mg Kamagra, including sildenafil, is generally effective for up to 4 to 6 hours after ingestion. However, individual responses can vary based on factors like metabolism, overall health, and other medications being taken. The jelly form is designed to be absorbed quickly, potentially offering a faster onset of action compared to tablets. Always follow the dosing instructions provided by your healthcare provider or the product guidelines, and consult with them if you have any concerns or questions about its use.