Undecylenic acid topical

Undecylenic acid is a fatty acid that helps stop fungus from growing on the skin.

Undecylenic acid topical (for the skin) is used to treat skin infections caused by fungus, such as athlete's foot, jock itch, or ringworm.

Undecylenic acid topical may also be used for other reasons not mentioned in this medication guide.

Use exactly as directed on the label, or as prescribed by your doctor.

Do not take by mouth. Topical medicine is for use only on the skin.

Use only the undecylenic acid topical formulation made for the specific body area you are treating (such as your feet, groin, or nails). This medicine will not work if you do not use the correct formulation.

Do not let a young child use undecylenic acid topical without help from an adult.

Wash your hands before and after using this medicine.

If you are using undecylenic acid topical on your feet, apply the medicine to all areas, including between your toes.

Do not cover treated skin with a bandage. You may cover the skin with a cotton gauze dressing to protect your clothing.

Avoid wearing tight-fitting, synthetic clothing (such as nylon) that does not allow air circulation. Wear loose clothing made of cotton and other natural fibers until the infection is healed.

Change your shoes and socks at least once daily while treating athlete's foot.

Call your doctor if your symptoms do not improve after 4 weeks of treatment.

Use this medicine for the full prescribed length of time, even if your symptoms quickly improve.

Store at room temperature away from moisture and heat. Do not freeze.

Follow all the instructions on your medicine label and package. Inform each of your healthcare providers about all your medical conditions, allergies, and all medicines you are taking.

You should not use undecylenic acid topical if you are allergic to it.

Ask a doctor or pharmacist if undecylenic acid topical is safe to use if you have sensitive skin or allergies.

Do not give this medicine to a child without medical advice.

Ask a doctor before using this medicine if you are pregnant or breast-feeding.

Get emergency medical help if you notice signs of an allergic reaction: hives; trouble breathing; swelling of your face, lips, tongue, or throat.

undecylenic acid topical may cause serious side effects. Stop using undecylenic acid topical and call your doctor immediately if you experience:

• severe burning or stinging of the treated skin; or
• any new skin symptoms.

Common side effects of undecylenic acid topical may include:

• irritation of the treated skin.

This is not a complete list of side effects, and others may happen. Call your doctor for medical advice about side effects. You can report side effects to the FDA at 1-800-FDA-1088.

Apply the medicine as soon as possible, but skip the missed dose if it is nearly time for your next dose. Do not apply two doses at the same time.

An overdose of undecylenic acid topical is not expected to be dangerous. Seek emergency medical attention or call the Poison Help line at 1-800-222-1222 if anyone has accidentally swallowed the medication.

Do not get undecylenic acid topical in your eyes. If contact does occur, rinse with water.

Medicine used on the skin is not likely to be affected by other drugs you use. However, many drugs can interact with each other. Inform each of your health care providers about all medicines you use, including prescription and over-the-counter medicines, vitamins, and herbal products.