If you experience chronic constipation, or if eating prunes and drinking prune juice doesnât solve your problems, contact your doctor for professional advice. Also, make sure to talk to your doctor if you begin to experience: 1  rectal or abdominal pain.  blood in stool.
agonist agÂ·oÂ·nist (Äg'É-nÄ­st) n. A contracting muscle that is resisted or counteracted by an antagonistic muscle. A substance that can combine with a cell receptor to produce a reaction typical for that substance.
A drug that is an agonist attaches itself to receptors in the brain, and then produces a chemical reaction. For example, heroin is an opioid agonist. It binds to opioid receptors that control pleasure and pain, the result being a feeling of euphoria and well being.Other examples of opioid agonists, sometimes referred to as âfull agonists,â are oxycodone, morphine and opium.ntagonist therapy has several benefits. Patients receiving antagonist drugs, such as Naltrexone, which is used in the treatment of opioid addiction, do not develop a tolerance to the medication. Additionally, antagonist drugs are not addictive in and of themselves.