An antispasmodic (synonym: spasmolytic)'s a drug or an herb that suppresses spasms. These are usually caused by smooth muscle contraction, especially in tubular organs. The effect's to prevent spasms of the stomach, intestine or urinary bladder. Examples Both dicyclomine and hyoscyamine are antispasmodic due to their anticholinergic action. Both of these drugs have general side effects and can worsen gastroesophageal reflux disease. Peppermint oil has been traditionally used as an antispasmodic,… (More on Antispasmodic)