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How does this medication work? What will it do for me?
Voriconazole belongs to the family of medications called antifungals. It is used to treat certain types of invasive (inside the body) fungal infections, specifically Aspergillus or Candida infections. It works by preventing the fungus from growing.
This medication may be available under multiple brand names and/or in several different forms. Any specific brand name of this medication may not be available in all of the forms or approved for all of the conditions discussed here. As well, some forms of this medication may not be used for all of the conditions discussed here.
Your doctor may have suggested this medication for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking this medication, speak to your doctor. Do not stop taking this medication without consulting your doctor.
Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take this medication if their doctor has not prescribed it.
What form(s) does this medication come in?
Apo-Voriconazole is no longer being manufactured for sale in Canada. For brands that may still be available, search under voriconazole. This article is being kept available for reference purposes only. If you are using this medication, speak with your doctor or pharmacist for information about your treatment options.
How should I use this medication?
The recommended adult starting dose of voriconazole is either 200 mg or 400 mg, taken 12 hours apart for the first 24 hours. After the first 24 hours, the recommended dose is 100 mg or 200 mg, taken twice daily. For both the starting dose and the maintenance dose, the dose used depends on your body weight and the type of infection. Your dose may be adjusted by your doctor depending on how you respond to voriconazole and the side effects you experience.
Voriconazole tablets should be taken 1 hour before or 2 hours after a meal.
Voriconazole oral suspension must be taken 1 hour before or after a meal.
If you are using the oral suspension, shake the closed bottle for approximately 10 seconds before each use. The suspension should only be administered using the oral dispenser supplied with each pack.
Voriconazole oral suspension should not be mixed with any other medication or flavouring agent and it should not be further diluted with water or any other drinks.
Injection: The dose for voriconazole intravenous (into the vein) injection depends on body weight and the type of infection. Your doctor will determine the right dose for you. The typical recommended starting dose of voriconazole injection during the first 24 hours is 2 doses of 6 mg for each kilogram of body weight, given 12 hours apart. After the first 24 hours, the recommended dose is 3 mg or 4 mg for each kilogram of body weight twice daily. Intravenous treatment with voriconazole should not exceed 6 months. The dose is usually injected slowly into a vein over 1 to 2 hours in a clinic setting (e.g., hospital). Your dose may be adjusted by your doctor depending on how you respond to voriconazole and the side effects you experience.
Many things can affect the dose of a medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
Your dose may be adjusted by your doctor depending on how you respond to voriconazole and the side effects you experience.
It is important to use this medication exactly as prescribed by your doctor. If you miss a dose, skip the missed dose and continue with your regular dosing schedule.
Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Voriconazole tablets and oral suspension, as well as the injectable forms of this medication, should be stored at room temperature. Keep it out of reach of children. Safely discard any suspension that is left over after 14 days.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.
Who should NOT take this medication?
Do not take voriconazole if you:
- are allergic to voriconazole or any ingredients of the medication (It is not known if people who are allergic to other "azole" antifungal medications [e.g., ketoconazole, fluconazole, and itraconazole] will also be allergic to voriconazole.)
- are also taking any of the following medications:
- ergot alkaloids (ergotamine and dihydroergotamine)
- long-acting barbiturates (e.g., phenobarbital)
- St. John’s wort
What side effects are possible with this medication?
Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.
The side effects listed below are not experienced by everyone who takes this medication. If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor.
The following side effects have been reported by at least 1% of people taking this medication. Many of these side effects can be managed, and some may go away on their own over time.
Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.
- eye pain and irritation
- back pain
- hair loss
- increased sensitivity of the skin to the sun
- stomach pain
Although most of these side effects listed below don’t happen very often, they could lead to serious problems if you do not check with your doctor or seek medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
- blood pressure changes
- sensations of burning, tingling, or numbness
- chest pain or tightness
- facial swelling
- feeling faint
- difficulty breathing
- flu-like symptoms (e.g., fever, chills, flushing, sweating, cough)
- hallucinations (e.g., seeing, hearing, or feeling things that are not actually there)
- increased sensitivity to touch
- joint pain
- irregular or rapid heartbeat
- signs of heart problems (e.g., fast, irregular heartbeat or pulse, chest pain, sudden weight gain, difficulty breathing, leg swelling)
- signs of kidney problems (e.g., decreased urination, nausea, vomiting, swelling of the feet and ankles)
- signs of pancreatitis (e.g., abdominal pain on the upper left side, back pain, nausea, fever, chills, rapid heartbeat, swollen abdomen)
- swelling of the hands and feet
- symptoms of liver problems (e.g., yellow eyes or skin, itching, unusual tiredness or weakness, stomach pain, nausea, vomiting)
- symptoms of low sodium levels in the blood (e.g., achy, stiff, or uncoordinated muscles; confusion; tiredness; weakness)
- vision changes (e.g., blurry vision, colour vision change, reduced vision, increased sensitivity of the eyes to light)
Stop taking the medication and seek immediate medical attention if any of the following occur:
- symptoms of a severe allergic reaction (e.g., itching; skin rash or blisters; shortness of breath; difficulty breathing; swelling of the face, lips, or tongue)
- symptoms of a severe skin reaction (e.g., blistering, peeling, a rash covering a large area of the body, a rash that spreads quickly, or a rash combined with fever or discomfort)
Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking this medication.
Are there any other precautions or warnings for this medication?
Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.
Abnormal heart rhythms: This medication can cause abnormal heart rhythms. Certain medications (e.g., sotalol, quinidine, thioridazine, chlorpromazine, droperidol, pimozide, moxifloxacin, mefloquine, pentamidine, arsenic trioxide, tacrolimus) can increase the risk of a type of abnormal heart rhythm called QT prolongation, and should not be used in combination with voriconazole. You are more at risk for this type of abnormal heart rhythm and its complications if you:
- are female
- are older than 65 years of age
- have a family history of sudden cardiac death
- have a history of heart disease or abnormal heart rhythms
- have a slow heart rate
- have congenital prolongation of the QT interval
- have diabetes
- have had a stroke
- have low potassium, magnesium, or calcium levels
- have nutritional deficiencies
If you have heart disease and abnormal heart rhythms, or are taking certain medications, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.
Allergy: It is not clear whether people who have previously had an allergic reaction to another "azole" antifungal will have an allergic reaction to voriconazole. Make certain all medical professionals involved in your care know if you have had an allergic reaction to a different antifungal medication in this class, before taking voriconazole.
Contact your doctor at once if you experience signs of an allergic reaction, such as skin rash, itching, difficulty breathing, or swelling of the face and throat.
Driving: Voriconazole can cause blurred vision and increased sensitivity of the eyes to light. If you experience any vision changes, avoid driving or hazardous activities until your vision has returned to normal. Driving at night should be avoided while taking voriconazole.
Infusion related problems: Reactions may occur during the infusion of the intravenous formulation of voriconazole. These include flushing, fever, sweating, rapid heart rate, chest tightness, difficulty breathing, feeling faint, nausea, itching, and rash. Report these to your doctor if they occur, as the infusion may have to be stopped.
Kidney problems: Rarely, voriconazole has been linked to developing kidney problems. If you have reduced kidney function or kidney disease, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.
Signs of decreasing kidney function include the production of very small amounts of urine, swelling in your legs and feet, loss of appetite, nausea, vomiting, confusion and anxiousness, or excessive sleepiness. If you notice any of these, contact your doctor as soon as possible.
Lactose: Voriconazole tablets contain lactose. If you have or suspect you have galactose intolerance, Lapp lactase deficiency, or glucose-galactose malabsorption, voriconazole tablets may worsen your condition.
Liver function: Liver disease or reduced liver function may cause this medication to build up in the body, causing side effects. As well, voriconazole may reduce liver function and can cause liver failure. Your doctor will monitor the function of your liver while you are taking this medication. If you have liver problems, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed. Your doctor may want to test your liver function regularly with blood tests while you are taking this medication.
Although serious liver reactions have been rare, contact your doctor if you notice signs of liver problems such as unusual fatigue, loss of appetite, nausea or vomiting, yellowing of the skin or eyes, dark urine, or pale stools. If you have severe liver cirrhosis, voriconazole should only be used if the benefits outweigh the risks, and you should be closely monitored by your doctor while you are taking the medication.
Pancreatitis (inflammation of the pancreas): Voriconazole may cause or worsen pancreatitis. If you have a history of or are at risk for developing pancreatitis (i.e., have had chemotherapy or a stem cell transplant), you should be closely monitored by your doctor while taking this medication. If you develop signs of pancreatitis (e.g., upper left abdominal pain, back pain, nausea, fever, chills, rapid heartbeat, swollen abdomen), contact your doctor.
Skin reactions: In rare cases, people have had skin reactions when they have taken this medication. If you get a skin rash that worsens, or if you experience exfoliating skin conditions such as peeling, shedding, or scaling of the skin, or any other unusual reaction of the skin, contact your doctor immediately. Your skin may also become sensitive to sunlight. Try to avoid strong sunlight while taking this medication.
Vision changes: Voriconazole may cause blurry vision, reduced vision, colour vision change, and increased sensitivity of the eyes to sunlight. Most visual symptoms should clear up within 60 minutes. Avoid driving or operating machinery if you experience any changes in vision. Do not drive at night while taking voriconazole.
Pregnancy: Voriconazole can cause harm to the fetus when the medication is taken during pregnancy. Voriconazole should not be used during pregnancy. Women who may become pregnant should always use an effective form of birth control during treatment with voriconazole. If you become pregnant while taking this medication, contact your doctor immediately.
Breast-feeding: It is not known if voriconazole passes into breast milk. If you are breast-feeding and are taking this medication, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: The safety and effectiveness of using this medication have not been established for children less than 12 years of age.
What other drugs could interact with this medication?
There may be an interaction between voriconazole and any of the following:
- alpha blockers (e.g., alfuzosin, doxazosin, silodosin, tamsulosin)
- amphotericin B
- angiotensin receptor blockers (ARBs; e.g., candesartan, irbesartan, losartan)
- anti-cancer medications (e.g., cabazitaxel, docetaxel, doxorubicin, etoposide, ifosfamide, irinotecan, vincristine)
- antihistamines (e.g., cetirizine, doxylamine, diphenhydramine, hydroxyzine, loratadine)
- antipsychotic medications (e.g., chlorpromazine, clozapine, haloperidol, quetiapine, ziprasidone)
- other "azole" antifungals (e.g. fluconazole, ketoconazole, itraconazole)
- barbiturates (e.g., butalbital, pentobarbital, phenobarbital)
- benzodiazepines (e.g., alprazolam, chlordiazepoxide, clonazepam, clorazepate, diazepam, flurazepam, midazolam)
- birth control pills
- calcium channel blockers (e.g., amlodipine, diltiazem, felodipine, verapamil)
- inhaled corticosteroids (e.g., budesonide, ciclesonide, fluticasone)
- oral corticosteroids (e.g., dexamethasone, hydrocortisone, prednisone)
- ergot alkaloids (e.g., ergotamine and dihydroergotamine)
- estrogens (e.g., conjugated estrogen, estradiol, ethinyl estradiol)
- "gliptin" diabetes medications (e.g., linagliptin, saxagliptin, sitagliptin)
- grapefruit juice
- HIV integrase inhibitors (e.g., bictegravir, elvitegravir, raltegravir)
- HIV non-nucleoside reverse transcriptase inhibitors (NNRTIs; e.g., efavirenz, etravirine, nevirapine)
- HIV nucleoside reverse transcriptase inhibitors (NRTIs; e.g., abacavir, didanosine, lamivudine, tenofovir, zidovudine)
- HIV protease inhibitors (e.g., atazanavir, indinavir, ritonavir, saquinavir)
- lumacaftor and ivacaftor
- macrolide antibiotics (e.g., azithromycin, clarithromycin, erythromycin, telithromycin)
- nitrates (e.g., isosorbide dinitrate, isosorbide mononitrate)
- opioid pain relievers (e.g., fentanyl, morphine, methadone, oxycodone)
- phosphodiesterase 5 inhibitors (e.g., sildenafil, tadalafil, vardenafil)
- progestins (e.g., dienogest, levonorgestrel, medroxyprogesterone, norethindrone)
- proton pump inhibitors (e.g., omeprazole, esomeprazole, lansoprazole)
- quinolone antibiotics (e.g., ciprofloxacin, norfloxacin, ofloxacin)
- St. John’s wort
- saccharomyces boulardii
- selective serotonin reuptake inhibitors (SSRIs; e.g., citalopram, fluoxetine, paroxetine, sertraline)
- "statin" medications (e.g., atorvastatin, lovastatin, simvastatin)
- sulfonylurea diabetes medications (e.g., chlorpropamide, gliclazide, glyburide, tolbutamide)
- "triptan" migraine medications (e.g., almotriptan, eletriptan, sumatriptan)
- tyrosine kinase inhibitors (e.g., bosutinib, dasatinib, imatinib, nilotinib, sunitinib)
If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:
- stop taking one of the medications,
- change one of the medications to another,
- change how you are taking one or both of the medications, or
- leave everything as is.
An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.
Medications other than those listed above may interact with this medication. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.
All material copyright MediResource Inc. 1996 – 2022. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Source: www.medbroadcast.com/drug/getdrug/Apo-Voriconazole