If my child is on antibiotics, can he receive vaccination at his "well-child" visit or should we plan to go back after his cipro (ciprofloxacin) is done? how long off

Yes: You can get your well kid shots when you are taking antibiotics.

Abx don't interfere : The presence of antibiotics will not alter a child's response to vaccines. Twenty or more years ago we often deferred the vaccines if a kid had a fever due the potential added stress of expected fever with the old pertussis vaccine. Todays vaccines are so free of issues that we seldom need to delay their use.