No problem was seen when pancuronium was given after Cisatracurium had partly or fully worn off, whether it was a single dose or a drip. However, this was never tested in a proper, systematic clinical trial, so the finding is based on observation only. Both medicines are used in hospital by anaesthetists, who choose the timing and dose.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.