Candidiasis can occur in the mouth, throat, windpipe, vagina or on the skin. It can also spread throughout the body. While this is rare, it is life-threatening. The most common places for infection are in the mouth and vagina. Recurrent and difficult to treat vaginal yeast infections are a sign of HIV disease progression in women.
This publication focuses on systemic candidiasis -- when it spreads throughout the body and may impact many systems. Project Inform materials are also available on Vaginal Candidiasis or Oral Candidiasis.
However, a weak immune system makes it easier for Candida to grow and cause infection. In HIV disease, the most serious Candida outbreaks occur when CD4+ cell counts are very low (below 100). In people with weak immune systems, candidiasis can recur and be difficult to treat.
Factors including diabetes, pregnancy, iron, folate, and vitamin B12 or zinc deficiency, and use of antihistamines can increase the risk of Candida infections. Things that may weaken the immune system -- from chemotherapy to stress and depression -- can also cause or worsen candidiasis.
If a person with thrush has problems swallowing (food "gets stuck") and/or has bad chest pain, he or she may also have esophageal infection. If symptoms do not improve with treatment, or if someone has problems swallowing but does not have thrush, an endoscopy is usually performed. This is when a doctor uses a small tube to look into the esophagus.
Systemic candidiasis is very difficult to diagnose. Candida in the blood may come from a local infection (like the mouth or site of a catheter) as well as from infection of internal organs. Candida may only briefly be present in the blood when an internal organ is infected, therefore a blood test result is not always reliable.
Mouth RinsesMouth rinses are less effective as they only have contact with the mouth for a short time. However, they may be the best choice for someone with a very sore or dry mouth. Rinses are held in the mouth for as long as possible and should be swilled around and then swallowed. They are used at least four times a day and continued for a few days after the symptoms have gone. The most widely used rinse is nystatin (Mycostatin Oral Suspension).
LozengesFor oral symptoms, one or two lozenges or troches are taken three to five times a day. They should be sucked slowly and not chewed or swallowed whole. Common brands are clotrimazole (Mycelex) and nystatin (Mycostatin).
Creams and OintmentsCreams and ointments are used for skin and nail infections. They can be used at the corners of the mouth or rubbed into affected areas of skin, including the labia. They should be applied two to four times a day by gentle and thorough massage. The length of therapy varies, but it often takes 10-20 days and should continue for a few days after the symptoms clear up.
Products include amphotericin B (Fungizone), clotrimazole (Lotrimin), clotrimazole plus a steroid (Lotrisone), miconazole (Monistat-Derm), clotrimazole (Mycelex), nystatin plus a steroid (Mycolog-II), nystatin (Mycostatin), ketoconazole (Nizoral) and econazole (Spectazole). Creams containing a steroid should not be used for children under 12. Some creams can be bought over the counter and as a prescription. Over-the-counter products are usually labeled for treating athlete's foot or jock itch.
Vaginal SuppositoriesVaginal suppositories or tablets are put into the vagina once only (clotrimazole) or once a day for three days (miconazole). Common brands are GyneLotrimin and Mycelex-G (clotrimazole) and Monistat 3 (miconazole). A single oral dose of fluconazole (Diflucan) is increasingly used for treating vaginal candidiasis.
Ketoconazole (Nizoral) is taken at 200 or 400 mg once a day. It needs acid to be absorbed, so it should be taken with food. Antacids should be avoided. It should also not be taken at the same time as other therapies that may contain a buffer or antacid, like ddI (didanosine, Videx). It may not be well absorbed in people with gut problems or who cannot eat very much. Taking it with an acidic drink like a cola may help.
Fluconazole (Diflucan) is taken at 200 mg the first day, then 100 mg once a day thereafter. Treatment typically lasts two weeks for oral or skin candidiasis and three weeks for esophageal infection (or two weeks after symptoms clear up, whichever is longer). The dose may be increased to 400 mg per day if the lower dose does not work.
Studies suggest that fluconazole is more effective than ketoconazole. Some doctors still prefer to treat aggressive fungal infections with other drugs, like ketaconazole, in order to save the potent fluconazole for later use, if necessary. Resistance to fluconazole is well documented. Once it develops, then treatment options are very limited.
Itraconazole (Sporanox) appears to be at least as potent as ketoconazole and may be as good as fluconazole. It needs stomach acid to be absorbed, so it should be taken with food. The dose is 200 mg per day. If not enough drug is being absorbed, blood levels may need to be checked so the dose can be increased.
Itraconazole oral solution is more effective and puts higher levels of the drug in the blood than the capsule. There is a great potential for interactions between itraconazole and many anti-HIV drugs. For more information, read Project Inform's publication, Drug Interactions.
Fungizone (amphotericin B) is given directly into a vein. It's used to treat disseminated candidiasis when other systemic therapies fail or the infection is very aggressive. It is sometimes used with another drug, flucytosine, to treat specific fungal infections like cryptococcal infections.
This used to be the standard treatment for systemic or serious fungal infections. It lasted 8-12 weeks and often gave severe side effects, like kidney damage and anemia. People are now usually given amphotericin B until they start to improve (usually two weeks). They are then switched to fluconazole at 200-400 mg per day.
Other forms of amphotericin B are used when systemic infections become resistant or less responsive to standard therapy. These include amphotericin B colloidal dispersion (ABCD, Amphotec) and amphotericin B lipid complex (ABLC, Abelcet). These might have fewer side effects than standard amphotericin B, but all of them can be quite toxic.
In animal studies, using itraconazole or ketoconazole during pregnancy caused birth defects. There have also been four known infants born with severe skeletal problems to women who used fluconazole for an extended time while pregnant. It's presumed that these same risks apply to other oral azole drugs.
For treating or preventing oral or vaginal candidiasis, topical therapies like nystatin (Mycostatin, Pedi-Dri) may be preferable for pregnant women. For treating or preventing other fungal infections, like histoplasmosis, the Guidelines suggest amphotericin B, especially in the first trimester. It is also approved for treating thrush.
Although no formal studies have been performed, pregnant women have used amphotericin B without apparent harm to their unborn children. While amphotericin B may be preferable to azole therapy in pregnant women, it has possible severe side effects, including kidney toxicity and anemia.
Resistance to azole drugs has often required using amphotericin B. While potent and effective, amphotericin B is toxic, especially to the kidney. Newer versions, such as ABLC, Ambisome and Abelcet, have proven less toxic to the kidneys than the earlier formula. Moreover, a recent study comparing the earlier form to ABLC found that people tolerated ABLC better, which improved their ability to take the drug until the fungal infection successfully cleared. Even among people with some underlying kidney disease, ABLC was better tolerated, resulting in only very small changes in kidney function tests.
Nevertheless, recent studies show that exposure to azole treatment decreases the antifungal activity of amphotericin B. This will likely be the case for newer, less toxic forms of the drug; but more studies need to confirm this. Two other drugs have also been shown to be active against azole-resistant Candidiasis. Voriconazole (Vfend) was recently approved in May of 2002 and showed enhanced activity against fluconazole-resistant candidiasis. Based on clinical trial data, dosage requirements are 200 mg twice daily or 3-6 mg/kg intravenously every 12 hours. Another drug called caspofungin acetate (Cancidas) has also shown activity against azole-resistant strains of candidiasis. Recommended dosage is 50 mg/day.
There are drug interactions that have been observed including with anti-HIV drugs, specifically efavirenz (Sustiva), nelfinavir (Viracept) and nevirapine (Viramune). The recommendation is to increase the daily dose to 70 mg if a person is taking any of these anti-HIV drugs.
Because of antifungal drug resistance, using drugs to prevent fungal infections is approached with great caution and is generally discouraged. For example, when fluconazole is used to prevent these infections and resistance develops, treating newer and more aggressive infections is difficult and often unsuccessful. So keeping the antifungal drugs for treatment is generally a more desirable approach. Some people with recurrent infections do remain on long-term therapy to prevent them. In this case, however, resistance still remains a concern.
Most nutritionists agree that sugar, yeast, dairy, wheat, caffeine, nicotine and alcohol are the main culprits because they help yeast to grow. To prevent this, they recommend eating as little as possible of these types of foods.
Another approach is to eat larger amounts of foods that may keep yeast from growing. For example, some nutritionists believe garlic has natural antifungal properties that may help prevent candidiasis. Fresh garlic is considered best, although commercial garlic "pills" help reduce the odors. Fresh garlic can be mixed into other foods, eaten raw (up to six cloves a day), or minced and put into empty gelatin capsules. (Note: It's unknown if large amounts of garlic interfere with anti-HIV therapies, but it may increase the risk of side effects from using ritonavir [Norvir].)
Another factor that can contribute to uncontrolled yeast growth is using antibiotics. "Friendly" bacteria are found naturally in the body and establish a healthy balance while eliminating unfriendly yeasts. Many common antibiotics, like tetracycline and penicillin, kill these bacteria which then allow yeast to grow, especially in the vagina. It is not unusual, even for people with healthy immune systems, to experience a fungal infection after using antibiotics.
In order to lessen this effect from antibiotics and promote healthy bacteria in general, many nutritionists recommend adding Lactobacilli acidophilus bacteria to your diet. It can be found in yogurts and certain milks (look for Lactobacilli acidophilus on the label). You can also take it in pill form, available at many health food stores.
Oral candidiasis can change how you taste and enjoy foods. It can also make eating and swallowing difficult. Avoiding acidic, spicy or hot foods as well as cigarettes, alcohol and carbonated drinks may help. All of these can irritate the insides of your mouth. Soft, cool and bland foods (like oatmeal, mashed beans, apple sauce, etc.) are recommended.
Liquid food supplements are often used to ease mouth infections and/or for weight maintenance. Remember supplements are not intended to replace solid foods. Many of these are high in sugars, which can help yeast grow. If you use supplements, make sure they contain mainly complex carbohydrates, are high in protein and have low-to-moderate sugar levels. For more information on food supplements, read Project Inform's publication, Maintaining Weight and Nutrition.
Overall, the best way to naturally prevent fungal infections is to eat healthfully and regularly, avoid excessive sugar intake and avoid or decrease alcohol and cigarettes.
This article was provided by Project Inform. Visit Project Inform's website to find out more about their activities, publications and services.