"prompt and efficient" is correct and can be used in written English. You can use it to describe a person or a service. For example, "The customer service team at the store provides prompt and efficient service.".
SERVICE -- Prompt and efficient.
At times, service can be prompt and efficient, but it can also be frustrating.
The directors said they had ordered an independent review that would be "thorough, prompt and efficient".
In such a busy, bustling establishment, service from white-shirted, black-waistcoated waiters is remarkably prompt and efficient.
Such a critical period suggests that, in preterm infants, the identification and treatment of hyperbilirubinemia must be prompt and very efficient.
These findings contribute to early identify patients at risk of developing albuminuria even when this classical predictor is still in the normal range, constituting a novel strategy towards a prompt and more efficient therapeutic intervention with better outcome.
Our data set the basis for a novel strategy towards a prompt and more efficient therapeutic intervention with better outcome, i.e. identifying patients at risk of developing albuminuria and in whom enhancement of RAS blockade, probably by using a mineralocorticoid receptor antagonist, may be indicated.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK