Anticholinergic medications

Author: Dr Tom Moodie, Dermatology Registrar, Waikato Hospital, Hamilton, New Zealand, 2013.

What are anticholinergic medications?

Anticholinergic medications are a class of drug that block the neurotransmitter acetylcholine in the central and peripheral nervous system. They are used to treat a wide variety of conditions. In dermatology, anticholinergics are used to help control hyperhidrosis.

The most commonly prescribed anticholinergics for hyperhidrosis are:

Mechanism of action of anticholinergic medications

Anticholinergic drugs competitively inhibit binding of the neurotramsmitter, acetylcholine. They target either muscuranic acetylcholine receptors or, less commonly, nicotinic acetylcholine receptors.

Adverse effects of anticholinergic medications

Side effects of anticholinergics include:

Side effects from anticholinergics are relatively common, especially in the elderly, and frequently lead to discontinuation of their use.

Anticholinergics should be used with caution in people with:

Interactions of anticholinergic medications with other drugs

Anticholinergic medications have potential interactions with many other drugs, especially those with cholinergic actions or anticholinergic side effects.

Anticholinergics in pregnancy

Most anticholinergics are pregnancy category B2. This means that safety in pregnancy has not been well established. Therefore, the drug should not be used in pregnant women or those likely to become pregnant, unless the expected benefits outweigh any potential risk.

Anticholinergics for hyperhidrosis

Oxybutinin is the best studied agent used for excessive sweating. It has proven to be effective for palmar and axillary hyperhidrosis in 50% of patients treated with 5mg twice daily. It is also effective for facial hyperhidrosis.

Glycopyrrolate is an ionized drug that targets the M3 receptors, a subset of muscuranic receptors found in glandular tissue. It has a lower incidence of neurological and ocular side effects compared with other anticholinergics. Glycopyrrolate is available as topical and oral formulations.

Propantheline can be used topically and orally to treat hyperhidrosis. The dose is 15-30 mg four times per day. Introduced in the 1970s, there are no contemporary studies evaluating propantheline for hyperhidrosis.

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