Symax FasTab Side Effects
Generic Name: hyoscyamine
Note: This page contains side effects data for the generic drug hyoscyamine. It is possible that some of the dosage forms included below may not apply to the brand name Symax FasTab.
For the Consumer
Applies to hyoscyamine: controlled-release tablets, drops, elixir, extended-release capsules, extended-release tablets, injection, oral spray, orally disintegrating tablets, tablets
Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur while taking hyoscyamine (the active ingredient contained in Symax FasTab)
Bloated feeling; blurred vision; constipation; decreased sweating; dizziness; drowsiness; dry mouth; enlarged pupils; excitability; headache; nausea; nervousness; trouble sleeping; weakness.
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); agitation; behavior changes; confusion; decreased sexual ability; diarrhea; difficulty focusing eyes; disorientation; exaggerated sense of well-being; fast or irregular heartbeat; hallucinations; loss of consciousness; loss of coordination; memory loss; mental or mood changes; severe or persistent trouble sleeping; speech changes; taste changes or loss; trouble urinating; unusual tiredness or weakness; vision changes; vomiting.
For Healthcare Professionals
Applies to hyoscyamine: compounding powder, injectable solution, oral capsule extended release, oral liquid, oral solution, oral spray, oral tablet, oral tablet chewable, oral tablet disintegrating, oral tablet extended release, sublingual tablet
Cardiovascular side effects have included tachycardia, premature ventricular depolarizations, and ventricular tachycardia.[Ref]
Gastrointestinal side effects due to the anticholinergic effects of hyoscyamine (the active ingredient contained in Symax FasTab) have commonly included dry mouth and mucous membranes. Other reported side effects include delayed gastric emptying time, reduced gastric acid secretion, constipation, and gastroesophageal reflux.[Ref]
Hyoscyamine (the active ingredient contained in Symax FasTab) toxicity (anticholinergic side effects) often presents as fever, tachycardia, agitation, and dry skin/mucous membranes.[Ref]
Genitourinary complications include urinary retention (due to anticholinergic effects on the urinary sphincter), which is common and dose-related, and impotence in male patients.[Ref]
Hypersensitivity reactions to hyoscyamine (the active ingredient contained in Symax FasTab) are rare. Reactions can include urticaria, eczema, papillary hyperplasia, mucopurulent discharge, eosinophilia, pruritus, edema, hypotension, abdominal pain, tachypnea, nausea and vomiting.[Ref]
Nervous system side effects have included lethargy and somnolence. Higher doses may be associated with mental confusion and/or excitement. The elderly appear to be more prone to the anticholinergic effects of hyoscyamine (the active ingredient contained in Symax FasTab) on the CNS.[Ref]
Ocular side effects due to the anticholinergic activity of hyoscyamine (the active ingredient contained in Symax FasTab) have included inhibition of the iris sphincter muscle (possibly resulting in mydriasis), follicular conjunctivitis, and inhibition of the ciliary muscle (which can produce blurred vision). All muscarinic antagonists can precipitate glaucoma.[Ref]
Endocrine side effects have included inhibition of exocrine sweat glands. This is usually not clinically significant except when perspiration becomes a major factor in body temperature control.[Ref]
1. "Product Information. Levsin (L-hyoscyamine)." Schwarz Pharma, Mequon, WI.
It is possible that some side effects of Symax FasTab may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
More about Symax FasTab (hyoscyamine)
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