Keep an eye on Intently (one)modafinil will boost the level or impact of citalopram by affecting hepatic enzyme CYP2C19 metabolism. Use Caution/Keep track of. Citalopram 20 mg/day is the most advised dose for people taking CYP2C19 inhibitors due to chance of QT prolongation. Wisor and Eriksson (2005) studied the results of modafinil in condi