You should not use  hyoscyamine if you have urination problems, a stomach or bowel obstruction, severe ulcerative colitis, glaucoma, or myasthenia gravis.
Before taking this medicine
You should not use hyoscyamine if you are allergic to it, or if you have:
a bladder obstruction or other urination problems;
an enlarged prostate;
a stomach or bowel obstruction (including paralytic ileus);
severe ulcerative colitis, or toxic megacolon;
glaucoma; or
myasthenia gravis.
Hyoscyamine is not approved for use by anyone younger than 2 years old.
Tell your doctor if you have ever had:
heart problems;
high blood pressure;
kidney disease;
a colostomy or ileostomy;
a thyroid disorder; or
hiatal hernia with GERD (gastroesophageal reflux disease).
It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.
It may not be safe to breast-feed while using this medicine. Ask your doctor about any risk.
