The ORAL bio-availability of hyoscine butylbromide is <1% and any antispasmodic action relating to the oral product is likely due to local action on the GI tract (NB: benefit in intestinal colic is debated).
Opioid side effects: A thread π§΅
Often very useful drugs
Often misunderstood
This group of drugs have diverse short term and long term side-effects to know about