"i was prescribed venalfaxine and after 10 days i experienced terrifying symptoms. i stopped taking it immediately, to the annoyance of the psychiatrist who had given  it. he then prescribed mirtazapine which i took at 15mg for 2 weeks with some success.  after 10 days on mirt i had three nights of heigtened anxiety, although nothing as bad as before taking the mirt. the psychiatrist then suggested upping my mirt to 30mg. i did this for 2 nights and felt dreadful. last night i reverted to 15mg and i intend to stay on it. i think it is worth remembering that taking drugs that &#039;mess with our heads&#039; is not like taking pain killers. if 15mg is good it does not mean that 30mg is better."