Fig. 3From: Prevalence and duration of prescribed opioid use during pregnancy: a cohort study from the Quebec Pregnancy CohortPatterns of opioids use during pregnancy by duration of treatment, duration of action and strength of the opioid medication. Strong opioids included fentanyl, hydromorphone, morphine and oxycodone. Weak opioids included codeine, meperidine, pentazocine, propoxyphene, tapentadol and tramadolBack to article page