Drug interactions
Hyoscyamine + Loxapine
Severity: Moderate
Hyoscyamine and Loxapine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Hyoscyamine is a potent antimuscarinic, and loxapine adds anticholinergic burden. The combination can cause confusion, hyperthermia, constipation, urinary retention and tachycardia, with greater risk in older patients.
What this interaction means in plain words
Hyoscyamine and Loxapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Hyoscyamine belongs to Genitourinary; Loxapine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic effects at central and peripheral receptors.
What to do
Monitor for anticholinergic toxicity such as delirium, ileus and urinary retention. Use the lowest effective dose of hyoscyamine or switch to a non-anticholinergic option.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Other interactions of Hyoscyamine
- Amantadine + Hyoscyamine Moderate
- Amitriptyline + Hyoscyamine Moderate
- Aripiprazole + Hyoscyamine Moderate
- Atropine + Hyoscyamine Moderate
- Benztropine + Hyoscyamine Moderate
- Bethanechol + Hyoscyamine Moderate
Frequently asked questions
Can I take Hyoscyamine with Loxapine?
MediHelp rates the interaction as moderate. Hyoscyamine and Loxapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Hyoscyamine is a potent antimuscarinic, and loxapine adds anticholinergic burden. The combination can cause confusion, hyperthermia, constipation, urinary retention and tachycardia, with greater risk in older patients.
How serious is the interaction between Hyoscyamine and Loxapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for anticholinergic toxicity such as delirium, ileus and urinary retention. Use the lowest effective dose of hyoscyamine or switch to a non-anticholinergic option.
What other medicines interact with Loxapine?
MediHelp also lists interactions of Loxapine with, for example, Alfentanil, Alprazolam, Amisulpride. The full list is on the Loxapine page.
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