Answer:
Answer is opioids.
Step-by-step explanation:
The opioids are drugs like opiums, and perform similar function like opium.
They are useful for the treatment of moderate and severe pain by acting on opioid receptors. The drug is also usuf in suppressing cough and diarrhea. It has side effects like sedation and nausea.
It should be noted that, a long term exposure to this drug can lead to drug tolerance, ahich can be described as physical tolerance and probably , withdrawal symptoms. Example is narcotics.