Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using hyoscyamine and call your doctor at once if you have:
anxiety, confusion, hallucinations, unusual thoughts or behavior;
weakness, memory problems;
slurred speech;
problems with balance or muscle movement;
diarrhea; o
pounding heartbeats or fluttering in your chest.
Common side effects may include:
dizziness, drowsiness, feeling weak or tired;
decreased sweating, decreased urination;
blurred vision;
rash;
dry mouth, decreased sense of taste;
stomach pain, nausea, vomiting, bloating;
diarrhea, constipation;
headache;
sleep problems (insomnia); or
impotence, loss of interest in sex, or trouble having an orgasm.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Hyoscyamine side effects (more detail)
