This is a popular question in many medical exams I thnk. 

SSRI Withdrawal symptoms

SSRIs can cause withdrawal symptoms if you stop taking them suddenly or if your dose is reduced. The most common symptoms are dizziness, feeling sick, headaches, a feeling that the room is spinning, and numb or tingly feelings. Other withdrawal symptoms are sweating, anxiety and problems sleeping.

Paroxetine seems more likely than some other SSRIs to cause these problems. In one study, nearly two-thirds of people taking paroxetine had withdrawal symptoms when they stopped taking it.

Venlafaxine can cause similar withdrawal symptoms. Although venlafaxine isn't an SSRI, it is a similar type of drug.

^{Source: BMJ}