Note about the cocaine question - as cocaine directly does not have an interaction, it is sometimes cut with various drugs (hydrocodone is a popular one in my area) and hydrocodone does seem to have an interaction with citalopram. As for the loss of appetite and stomach pains, i've been experiencing the same side effects. Cutting down on the amount of sugar i was consuming helped some. If you smoke marijuana it will help a lot honestly (especially in the appetite department.)