Efecto

"Efecto" translates into English as "effect." In the song, Bad Bunny outlines the effect his lover has on him. Since their first night together he's not been the same and she only has to look at the Puerto Rican rapper for him to start sweating. His world may be a mess, but when he's with the girl, Bad Bunny feels perfect.

That's Dominican urban music artist Chimbala who repeats "Esta no, esta sí" on the post-chorus. It's a sample of the 2021 track "Esta Si" performed by Chimbala, Dowba Montana and Chuky73.

Bad Bunny recorded "Efecto" for Un Verano Sin Ti. After he released the album, the reggaeton song debuted at #34 on the Hot 100 and in the Top 10 of many Spanish-speaking countries. It continued to float around the middle region of the Hot 100 for several months.