What happens when you stop taking methotrexate?

Patients who stopped taking methotrexate reported having substantially more gastrointestinal issues — including nausea, abdominal pain, and loss of appetite — from methotrexate than current users did. Just 26 percent of current MTX users reported nausea, compared with 40 percent of those who used it previously.

Does methotrexate accumulate in the body?

The MTX accumulation ratio of about 1.1 confirms the idea that MTX does not accumulate in plasma. Contrary to the parent medicine, 7-OHMTX accumulates in plasma 2.5-fold after the third weekly dose. The exposure of the body to the metabolite relative to the parent medicine is thus higher than that after a single-dose.