Name an unpleasant reaction that occurs when a drug is no longer taken?

Answer:
Assuming THE drug to be an addicting drug, the unpleasant reactions would be withdrawal symptoms. Intense craving, restlessness, head ache, sweating, palpitations, hallucinations etc. There might be photo-phobia and seizures too depending on the nature of the drug.
First answer by Doctorix. Last edit by Doctorix. Contributor trust: 2 [recommend contributor recommended]. Question popularity: 1 [recommend question].