Morphine

To treat really painful conditions, morphine is used. It occurs naturally as a dark brown resin in the opiate-family poppy (Papaver somniferum). It acts directly on the central nervous system (CNS) and can be given orally, sublingually, intravenously, subarachnoid, intramuscularly, intravertebral, transdermal, or through rectal suppositories. By exerting a direct influence on the central nervous system, it causes analgesia, changes the perception of the pain and affects how people feel about it. It might become physically and physiologically tolerant of repeated administration. It is widely used for the pain associated with a myocardial infraction, kidney stones, labour pain, and severe pain. It is utilised for both acute and chronic pain. Side effects of Morphine include: 

• Decrease respiratory effort 
• Nausea and Vomiting 
• Low Blood pressure
• Addiction and prone to abuse 
• Drowsiness, etc.