Opiate withdrawal can present with symptoms of:
Withdrawal from heroin can begin as early as 6 hours after the last dose, with symptoms peaking at 36-72 hours. Unlike alcohol withdrawal, it is unpleasant but not especially dangerous.
NICE specifically advises against prescribing opiates in withdrawal, favouring either lofexidine (an alpha 2 receptor agonist) or symptomatic management with medications such as benzodiazepines for agitation and anti-emetics/loperamide for GI symptoms.