One session lasts three to four months. While the downward pull of the muscle is reduced, the upward pull becomes relatively stronger and the jawline reads as lifted. When the drug wears off the downward pull returns, so keeping the result means repeating. This timeline does not apply to a double chin caused by fat.

Rarely, swallowing can feel odd. The drug is placed shallowly and in divided amounts across the front-neck muscle so it does not spread to the swallowing muscles, so most people have no issue, and when it happens it usually clears in a few days. If it persists or makes drinking difficult, see the doctor rather than waiting.

The jawline looks tidier over four to six weeks. The muscle needs time to lose its pull, so nothing changes overnight. A double chin caused by fat has a different cause and responds poorly to this treatment, so it is approached separately with fat-dissolving injections or another method.