Anal Itching (cont.)
Astringents
Astringents cause coagulation (clumping) of proteins in the cells
of the perianal skin or the lining of the anal canal. This action promotes
dryness of the skin, which in turn helps relieve burning, itching, and pain.
Examples of astringents include:
- calamine 5% to 25%
- zinc oxide 5% to 25% (Calmol 4, Nupercainal,
Tronolane)
- witch hazel 10% to 50% (Fleet Medicated, Tucks, Witch Hazel Hemorrhoidal Pads)
Antiseptics
Antiseptics inhibit the growth of bacteria and other organisms.
However, it is unclear whether antiseptics are any more effective than soap and
water.
Examples of antiseptics include:
- boric acid
- hydrastis
- phenol
- benzalkonium chloride
- cetylpyridinium chloride
- benzethonium chloride
- resorcinol
Keratolytics
Keratolytics are chemicals that cause the outer layers of skin or
other tissues to disintegrate. The rationale for their use is that the
disintegration allows medications that are applied to the anus and perianal area
to penetrate into the deeper tissues.
The two approved keratolytics used are:
- aluminum chlorhydroxy allantoinate (alcloxa) 0.2% to
2.0%
- resorcinol 1% to 3%
Analgesics
Analgesic products, like anesthetic products, relieve pain, itching,
and burning by depressing receptors on pain nerves.
Examples of analgesics include:
- menthol 0.1% to 1.0% (greater than 1.0% is not
recommended)
- camphor 0.1% to 3% (greater than 3% is not
recommended)
- juniper tar 1% to 5%
Next: Corticosteroids »
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