You can look this up by googling saffron and its
contraindications. You can also manage this stuff by buying a good herbal -- Prescription for Nutritional Healing and its companion Prescription for Herbal Healing are pretty good places to start. If you Google citalopram, it will also list contraindications, and some sites will have herbs as well. I don't know that saffron will be listed, though, as it's not been as commonly used as many others.