SEARCH Articles Figures Tables Cross-tolerance with opioids Opioid analgesic drugs tolerance Opioid cross-tolerance Opioid tolerance Opioid tolerance Opioid tolerance addiction Opioid tolerance development Opioid tolerance patients Opioid tolerance physical dependence Opioid tolerance psychological dependence Opioid tolerance types Tolerance due to opioids Tolerance with agonist-antagonist opioids Tolerance with opioids Tolerance, drug opioids