Duration decides how often you book treatment, so it belongs in your planning before the first visit. This guide reports the American Academy of Dermatology's published figure of about 3 to 4 months, then covers what repeat treatment may change and what to settle before a second appointment.

The published figure

The American Academy of Dermatology answers the question in its botulinum toxin FAQs. Its wording: "The effect lasts about 3 to 4 months — and sometimes longer."

Treat that as a range to plan around, not a date to circle on a calendar.

What repeat treatment may change

The same publisher adds a second point: "With repeat treatment for lines and wrinkles, the muscle may thin, leading to longer-lasting results."

Read the verb. The sentence says "may," and it describes repeat treatment, not a first visit. Nothing in it promises a longer interval to you in particular.

Reading it beside a second source

The American Society of Plastic Surgeons botulinum toxin overview is a good second page to open. Set it next to the AAD figure and note any place the two wording choices differ. If a clinic quotes you a different interval, ask which source it is working from.

What to settle before the next appointment

Two items are worth fixing before you plan a second visit:

• The date of your first treatment, written down, so you can measure your own interval against the published range.
• A question for your provider: how they decide when a follow-up makes sense for you.

With those two in hand, you can book the next step on your own timeline instead of the calendar's.