In an immortal society, could this be considered suicide?

Let’s pretend that mankind has achieved cheap, readily available and over-the-counter immortality. The only requirement to live longer than the Sun (barring a violent or stupid death) is to take a 2 dollar pill every 40 or so years. Failure to do so means you start to age normally, so even if you miss a dose or two you can go right back to being your young, healthy self so long as you haven’t leaped off the mortal coil.

Let’s say someone, after so many thousand years of taking said pill, decided they were simply done. They aren’t going to take the pill anymore. They’re not going to hang themselves, jump off a cliff or anything like that, they’re just going to continue their lives as normal, sans immortality.

Could that be considered a form of suicide?