depression
"My husband started taking this medication when he was depressed at work (and in the cold darkness of Finnish winter). After a few days, he suddenly became irritable, hyper-sensitive and seems to not recognise that he isn't the only person in the world and he is hurting other people. 

Now, two weeks later, he thinks he feels good and refuses to acknowledge that he has become a very different person, he thinks he has always been this way. Maybe he does feel good, but I am not the only person who has noticed and  complained about these personality changes he refuses to acknowledge. The man I am living with is not my husband and has done nothing but yell at me for the past couple weeks. This medication ruined our marriage quite efficiently."