As you can see, Effexor is amongst the least likely to cause weight
gain, and in fact, is known to contribute to weight loss
. You may wish to try an alternative on the list above.
It is unclear why anti-depressants cause weight gain. Here are some possibilities:
• Overeating, as a result of depression, can cause weight gain, esp if the person had lost weight in the pretreated depression
• Most anti-depressants, mood stabilizers and antipsychotics are also anti-histamines.