"hi. have read quite a few reviews here and pleased with the great advice &amp; positive feedback on citalopram. but i wanted to document my own experience on 20mg. i&#039;m only on day 4. i&#039;ve had quite a few side-effects but reading here i&#039;m reassured that&#039;s normal. i noticed side-effects within about 4hrs of taking first tablet: constant: brain fog, tinnitus ; occasional: headache, nausea, sweating and shooting anxiety ; rarely: brain-zaps, minor twitching of muscles. generally anxiety is slightly up. if i hadn&#039;t read other people&#039;s experiences of staying with this drug for a few weeks i may have gone back to the gp and asked for a different ad as the side-effects took me by surprise.  i just hope these will subside and i get some +ve benefits."