how long does botox take to work, Botox typically starts to work within a few days to a week after the injection. However, the full effects may take up to two weeks to become apparent. The onset and duration of Botox's effects can vary slightly depending on the individual and the specific area being treated. After receiving a Botox injection, it takes some time for the botulinum toxin to block the nerve signals that control muscle movement. As a result, you may start to notice a gradual reduction in muscle activity and a smoothing of wrinkles or fine lines in the treated area. The effects of Botox injections typically last for about three to four months, but this can also vary depending on individual factors such as metabolism and the specific dosage used.