Overview
Astramorph was a prescription drug approved by the U.S. Food and Drug Administration (FDA) to treat acute and chronic moderate or severe pain. Astramorph was also referred to by its drug name, morphine. 

Astramorph was an opioid, or synthetic opiate, that worked as a potent analgesic (painkiller). It was believed to work by reducing the perception of pain. According to the National Institute on Drug Abuse, regular use of opioids — even as prescribed by a doctor — could lead to dependence. If misused, opioids could cause overdose and death.

How was it taken?
Astramorph was given by injection in a clinical setting.

Side effects
The FDA-approved label for Astramorph listed common side effects including respiratory depression, apnea (temporary cessation of breathing), toxic psychosis, convulsions, itching, urinary retention, and constipation. 

Rare but serious side effects included dependence and respiratory failure.

For more details about this treatment, visit:
Astramorph PF: Package Insert / Prescribing Info — Drug.com