Police are concerned for missing Chichester man Richard Alexander.
Richard, 30, was last seen on Monday afternoon (January 14).
He is dependent on medication and he is not believed to have taken any with him.
Richard is white, 6' 1", of slim build and with short brown hair. He was last seen wearing black tracksuit bottoms, a white t-shirt, grey coat, black shoes and carrying a bag.
He will often travel on public transport, in particular the train.
If you have seen Richard or know of his whereabouts, please contact police online or ring 101 quoting serial 1153 of 14/01.