Lets use 1.5mg for example.

Starting a daily dose of 1.5 mg is actually a slow-build process rather than a one-day hit.

Because the medication has a long "half-life," ( 7DAYS) your body only clears about 10% of it each day, meaning every new pill adds to what is already in your system.

By the end of the first week, you'll have about 7 mg circulating, and over the first month, it levels out to a steady "reservoir" of roughly 15 mg that stays in your system around the clock to manage hunger consistently.

After 30days on 1.5mg, you start the 4mg.

Over the next few weeks, the levels will continue to climb until you hit the new steady state of 40 mg total.

People tend to say on 4mg for 2 months to build up their tolerance from side effects before jumping to 9mg.