Citalopram is prescribed for a number of disorders, the primary one being depression. The dosage schedule in the PDR for depression is:
20mg daily am or pm, may increase if needed to 40mg/day after 1 week; maintenance; after 6-8 weeks of initial treatment, continure for 24 weeks (32 weeks total), reevaluate long term usefulness (maximum dose 60mg)
Fibromyalgia.....40mg for 4 weeks
Hepatic dose/geriatic.....20mg may increase to 40mg/day if no response
Panic disorder.....20-30mg/day
I'm not sure why you mentioned your migraines. Citalopram has no affinity for migraines and headaches is the first side effect listed.
I am not a doctor nor a pharmacist, but going by the medical literature, 60mg/day is not unheard of with citalopram in the treatment of depression.
This question needs to be addressed by your doctor since you obviously have some concerns about it.
Peace
Greenlydia