Generic Name: terbinafine (TER-bin-a-feen/hye-DROX-ee-PROE-pil/KYE-toe-san)
Brand Name: Terbinex
Terbinafine is used for:
Treating certain fungal infections of the fingernails or toenails.
Terbinafine is an antifungal agent. It works by killing sensitive fungi.
Do NOT use terbinafine if:
- you are allergic to any ingredient in terbinafine
- you have liver problems
Contact your doctor or health care provider right away if any of these apply to you.
Before using terbinafine:
Some medical conditions may interact with terbinafine. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are pregnant, planning to become pregnant, or are breast-feeding
- if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
- if you have allergies to medicines, foods, or other substances
- if you have a history of kidney or liver problems, lupus, psoriasis, alcohol abuse or dependence, or blood problems (eg, anemia)
- if you have a weakened immune system
Some MEDICINES MAY INTERACT with terbinafine. Tell your health care provider if you are taking any other medicines, especially any of the following:
- Amiodarone, cimetidine, fluconazole, ketoconazole, or theophylline because they may increase the risk of terbinafine's side effects
- Rifampin or St. John's wort because they may decrease terbinafine's effectiveness
- Antiarrhythmics (eg, flecainide, propafenone), beta-blockers (eg, metoprolol), dextromethorphan, monoamine oxidase type B (MAO-B) inhibitors (eg, selegiline), selective serotonin reuptake inhibitors (SSRIs) (eg, fluoxetine), or tricyclic antidepressants (eg, amitriptyline, desipramine) because the risk of their side effects may be increased by terbinafine
- Anticoagulants (eg, warfarin) because their effectiveness may be decreased or the risk of their side effects may be increased by terbinafine
- Cyclosporine or tamoxifen because their effectiveness may be decreased by terbinafine
This may not be a complete list of all interactions that may occur. Ask your health care provider if terbinafine may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.
How to use terbinafine:
Use terbinafine as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- To use the tablets: Take by mouth with or without food.
- The tablets are taken for different amounts of time depending on your condition. The full benefit may not be seen for several months after stopping treatment. This includes the time period necessary for healthy nails to grow.
- To use the nail lacquer: Use at bedtime, unless your doctor tells you otherwise. Wash and dry the affected nails, then apply a thin coat of medicine.
- Do not apply the nail lacquer to a wound, or to broken or damaged skin.
- Use the nail lacquer until a new, healthy nail has grown, unless your doctor tells you otherwise. This usually takes 6 to 12 months, depending on your condition.
- To clear up your infection completely, take terbinafine for the full course of treatment. Keep taking it even if you begin to see improvement before the end of your therapy.
- If you miss a dose of terbinafine, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use terbinafine.
Important safety information:
- If you experience dizziness while taking terbinafine, use caution. Do not drive or perform other possibly unsafe tasks.
- Terbinafine only works against fungal infections; it does not treat bacterial or viral infections (eg, the common cold).
- Do NOT take more than the recommended dose or use for longer than prescribed without checking with your doctor.
- Be sure to use terbinafine for the full course of treatment. If you do not, the medicine may not clear up your infection completely. The fungus could also become less sensitive to this or other medicines. This could make the infection harder to treat in the future.
- Before using terbinafine, tell your doctor if you take a medicine that contains caffeine or if you consume large amounts of food or drink that contain caffeine (eg, coffee, tea, cocoa, cola, chocolate).
- Taste changes (eg, taste loss) or changes in smell (eg, loss of smell) have been reported in patients taking terbinafine. These effects may resolve after you stop taking terbinafine, but may last for a long time (eg, more than 1 year), or may become permanent. Tell your doctor right away if you experience changes in smell, taste changes, poor appetite, unwanted weight loss, or mood changes (eg, symptoms of depression).
- Terbinafine may cause you to become sunburned more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to terbinafine. Use a sunscreen or wear protective clothing if you must be outside for more than a short time.
- Rarely, terbinafine may cause severe or even fatal liver problems. If liver problems occur, they may be more severe in patients who have other active liver problems or a history of long-term liver problems. Discuss any questions or concerns with your doctor.
- The nail lacquer is for external use only. Do not get it in your eyes, nose, or mouth. If you get it in any of these areas, rinse right away with cool water.
- You may apply nail polish on top of the nail lacquer.
- Unless you are washing your hands, use gloves while using water or chemical substances to avoid accidentally washing the nail lacquer off. Wearing cotton under the gloves is preferred.
- The nail lacquer is flammable. Do not store or use near an open flame or while smoking.
- Lab tests, including liver function and complete blood cell counts, may be performed while you use terbinafine. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
- Terbinafine should be used with extreme caution in CHILDREN; safety and effectiveness in children have not been confirmed.
- PREGNANCY and BREAST-FEEDING: It is not known if terbinafine can cause harm to the fetus. Do not start taking terbinafine during pregnancy without talking with your doctor. If you think you may be pregnant, contact your doctor right away. You will need to discuss the benefits and risks of using terbinafine while you are pregnant. Terbinafine is found in breast milk. Do not breast-feed while taking terbinafine.
Possible side effects of terbinafine:
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur:
Diarrhea; feeling of fullness; gas; headache; indigestion; mild stomach pain; nausea.
Severe allergic reactions (rash; hives; itching; difficulty breathing or swallowing; tightness in the chest; swelling of the mouth, face, lips, throat, or tongue; unusual hoarseness; swollen lymph glands); mental or mood changes (eg, depression, restlessness, sadness, worthlessness); mouth sores; new or worsening symptoms of lupus (eg, butterfly-shaped rash on the face, joint pain, seizures, skin color changes, unusual sensitivity to the sun); pale skin or nail beds; red, blistered, peeling, or swollen skin; severe muscle or joint pain or tenderness; severe or persistent stomach pain (with or without nausea or vomiting); sleep problems; symptoms of infection (eg, fever, chills, persistent sore throat); symptoms of liver problems (eg, dark urine; loss of appetite; pale stools; unexplained, persistent nausea; vomiting; yellowing of the skin or eyes); unusual bruising or bleeding; unusual tiredness or weakness; vision or hearing changes.
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.
If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately. Symptoms may include dizziness; frequent urination; rash; severe headache or nausea; stomach pain; vomiting.Proper storage of terbinafine:
Store the tablets at room temperature, between 68 and 77 degrees F (20 and 25 degrees C), in a tightly closed container. Store away from heat, moisture, and light. Do not store in the bathroom. Store the nail lacquer at room temperature, between 59 and 86 degrees F (15 and 30 degrees C). Do not store near an open flame. Keep terbinafine out of the reach of children and away from pets.
- If you have any questions about terbinafine, please talk with your doctor, pharmacist, or other health care provider.
- Terbinafine is to be used only by the patient for whom it is prescribed. Do not share it with other people.
- If your symptoms do not improve or if they become worse, check with your doctor.
- Check with your pharmacist about how to dispose of unused medicine.
This information should not be used to decide whether or not to take terbinafine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about terbinafine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to terbinafine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using terbinafine.
Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using this medicine.