Drug interactions
Henbane + Pyridostigmine
Severity: Moderate
Henbane and Pyridostigmine: 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
Henbane contains hyoscyamine and scopolamine, which are antimuscarinic alkaloids that oppose the muscarinic effects of pyridostigmine. Pyridostigmine's benefit on gut, bladder and secretions may be blunted, while its nicotinic benefit at the neuromuscular junction is largely retained. Antimuscarinics can also mask early cholinergic toxicity symptoms.
What this interaction means in plain words
Henbane and Pyridostigmine 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.
Why it happens
Pharmacodynamic antagonism: muscarinic receptor blockade opposes the acetylcholine accumulation produced by cholinesterase inhibition.
What to do
Avoid unnecessary use of henbane-containing products in myasthenia patients. If an antimuscarinic is needed, monitor muscle strength and watch for cholinergic crisis, as its muscarinic warning signs may be masked.
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 Pyridostigmine
Frequently asked questions
Can I take Henbane with Pyridostigmine?
MediHelp rates the interaction as moderate. Henbane and Pyridostigmine 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. Henbane contains hyoscyamine and scopolamine, which are antimuscarinic alkaloids that oppose the muscarinic effects of pyridostigmine. Pyridostigmine's benefit on gut, bladder and secretions may be blunted, while its nicotinic benefit at the neuromuscular junction is largely retained. Antimuscarinics can also mask early cholinergic toxicity symptoms.
How serious is the interaction between Henbane and Pyridostigmine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid unnecessary use of henbane-containing products in myasthenia patients. If an antimuscarinic is needed, monitor muscle strength and watch for cholinergic crisis, as its muscarinic warning signs may be masked.
What other medicines interact with Pyridostigmine?
MediHelp also lists interactions of Pyridostigmine with, for example, Echothiophate iodide, Huperzine a, Neostigmine. The full list is on the Pyridostigmine page.
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