Jul
16
Adefovir
July 16, 2009 | Leave a Comment
Generic Name
Adefovir (ah-deh-FOE-veer)
Brand Name Hepsera
Type of Drug Antiviral.
Prescribed For
Chronic active hepatitis B in adults.
General Information
Hepatitis B is one of several different types of hepatitis, a viral infection of the liver. Adefovir is an antiviral drug that can reduce the amount of hepatitis B virus in the bloodstream and slow its spread to healthy liver tissue, however, it cannot cure chronic hepatitis B. People with chronic hepatitis B may develop liver cirrhosis or liver cancer and it is not known if adefovir can prevent these conditions from occurring. Like other viruses and bacteria, the hepatitis B virus can become resistant to the effects of adefovir.
Adefovir works against the hepatitis C virus in a way similar to that of certain human immunodeficiency virus (HIV) drugs. It interferes with an enzyme called reverse transcriptase, which is an essential component of the viral reproduction process. Almost half of each dose is eliminated via the urine within 24 hours of taking it.
Cautions and Warnings
Do not take adefovir if you are allergic or sensitive to any of its ingredients.
Adefovir can be toxic to the kidneys, especially in people who already have some kidney problems. Since it is eliminated from the body through the kidneys, people with kidney disease are often given lower doses of adefovir.
In some cases, hepatitis can become severely aggravated upon discontinuation of adefovir. Your doctor should check your liver for’ 2 weeks after the drug is stopped. it is possible that antiviral therapy may have to be re-started.
Adefovir has some activity against the human immunodeficiency virus (HIV). An HIV blood test is recommended before starting adefovir treatment. If you are HIV positive, adefovir could make the HIV virus resistant to future antiviral drugs.
People taking adefovir can develop liver disease, liver enlargement, fat degeneration, and lactic acidosis (potentially fatal metabolic imbalance). This may be a reason for your doctor to stop your adefovir treatment. This occurs most frequently in obese women.
Possible Side Effects
In studies, side effects reported in the treated group were similar in frequency to placebo.
✓ Most common: weakness, headache, stomach pain, and nausea.
✓ Less common: intestinal gas, diarrhea, and upset stomach.
Drug Interactions
This drug was studied extensively in an attempt to predict possible drug interactions. No major interaction problems have been revealed.
• Taking drugs that can be toxic to the kidneys (such as amino-glycosides, cyclosporine, nonsteroidal anti-inflammatory drugs (NSAIDs), tacrolimus, and vancomycin) together with adefovir can lead to the more rapid appearance of kidney damage.
• Ibuprofen, when taken in dosages of 800 mg 3 times a day, will increase adefovir blood levels by about 20 %, however the importance of this finding is unknown.
Food Interactions
Adefovir may be taken without regard to food or meals.
Usual Dose
Adults: 10 mg once a day. People with kidney disease requiring dialysis may take only 10 mg a week. The exact dosage is based on the severity of kidney disease.
Child: not recommended.
Overdosage
Gastrointestinal symptoms are the most likely outcome of an adefovir overdose. Take the victim to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Practice safe sex and safe needle use. People taking adefovir may still spread hepatitis B through sexual contact or by sharing needles. Practice safe sex using condoms and dental dams.
Do not share personal items that can have blood or body fluids on them, such as toothbrushes or razor blades.
Try to take adefovir at the same time every day.
Adefovir must be taken continuously to maintain its effectiveness. Be sure to keep enough adefovir on hand so that you do not run out of medicine.
If you take adefovir on a regular schedule and forget a dose, take it as soon as you remember. If it is almost time for your next dose, skip the forgotten dose and continue with your regular schedule. Do not take a double dose of this medicine. Call your doctor if you forget 2 or more doses in a row. Skipping or forgetting too many doses can make the hepatitis C virus resistant to adefovir.
Call your doctor at once if you feel very weak or tired, cold (especially in your arms and legs), dizzy or lightheaded, have unusual muscle pain, trouble breathing, stomach pain with nausea and vomiting, or have a fast or irregular heartbeat. These could be signs of lactic acidosis.
Call your doctor if you experience jaundice (symptoms include yellowing of the skin or whites of the eyes), appetite loss for a few days or more, lower stomach pain, nausea, dark urine, or bowel movements that are light in color. These could be signs of liver toxicity.
Special Populations
Pregnancy/Breast-feeding: Animal studies with adefovir have revealed a tendency for some birth defects when the dosage administered was more than 20 times the average human dose. There is no information on the effect of adefovir during pregnancy. The company that produces adefovir has established a registry to collect information on pregnant women who take this drug. When this drug is considered crucial by your doctor, its potential benefits may be carefully weighed against its risks.
It is not known if adefovir passes into breast milk. Nursing mothers who must take it should use infant formula.
Seniors: Seniors may be more sensitive to adefovir’s side effects because of the natural loss of kidney function that occurs with advancing age.
Jul
16
Adapalene
July 16, 2009 | Leave a Comment
Generic Name
Adapalene (uh-DAP-uh-lene)
Brand Name Differin
Type of Drug Anti-acne.
Prescribed For Acne.
General Information
Adapalene is similar to a retinoid. Retinoids are compounds related to vitamin A and are used in acne treatment. When adapalene is applied to an acne lesion, it modifies several of the processes involved in skin cell function. It reduces inflammation in the acne lesion and slows the formation of the material that fills the lesion. Very little adapalene is absorbed through the skin.
Cautions and Warnings
Do not use adapalene if you are allergic or sensitive to any of its ingredients. If you are sunburned, wait until your sunburn clears before applying adapalene to your skin. Avoid sun or sunlamp exposure while using adapalene. If you must be in the sun, be sure to apply sunscreen or wear protective clothing over areas where you have applied adapalene. Extreme wind or cold can also be irritating to skin where adapalene has been applied.
Adapalene can irritate the skin if used in combination with products such as medicated or abrasive soaps or cleansers, astringents, or soaps and cosmetics with a strong drying effect. Avoid products containing sulfur, resorcinol, or salicylic acid.
Adapalene can be highly irritating if it gets into your eyes or if it is applied to your lips, the angles of your nose, mucous membranes, cuts, abrasions, or sunburned or damaged skin. Avoid using depilatories or waxing while using adapalene.
Possible Side Effects
V Most common: redness, irritation, dryness, scaling, itching, and burning are common after applying adapalene to your skin. These effects usually occur during the first 24 weeks of adapalene use and subside as treatment continues. Symptoms may be severe enough to cause you to stop using adapalene; call your doctor if this happens to you.
V Rare: skin irritation, stinging sunburn, and worsening acne. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
None known.
Usual Dose
Adult and Child (age 12 and over): Wash affected areas with a mild or soapless cleanser and apply a thin layer of adapalene at bedtime.
Child (under age 12): not recommended.
Overdosage
Chronic ingestion of adapalene can cause liver toxicity and other side effects associated with swallowing large amounts of vitamin A. Swallowing adapalene gel is extremely dangerous for pregnant women, who should not take more vitamin A than is contained in their prenatal vitamins. Infants who swallow adapalene should be taken to a hospital emergency room for treatment.
Special Information
Stop using adapalene and call your doctor if you develop a severe skin reaction or any sign of drug allergy or reaction (symptoms include rash, hives, itching, changes in complexion, and breathing difficulties or irregularities).
Adapalene may exacerbate your acne at first, but you should see improvement within 2 weeks.
If you must be in the sun, be sure to apply sunscreen or wear protective clothing over areas to which you have applied adapalene.
Using more than a thin film of adapalene does not produce better results and may be more irritating to the skin.
If you forget to apply a dose of adapalene, apply it as soon as you remember. If it is almost time for your next application of adapalene, skip the dose you forgot and continue with your regular schedule.
Special Populations
PregnancylBreast-feeding., Animal studies of adapalene have shown no effects on the fetus. Since the effect of adapalene on pregnant women is not known, the drug should be used only when the possible benefits outweigh the risks.
It is not known if adapalene passes into breast milk. Nursing mothers should use infant formula.
Seniors: Seniors may use this drug without special precautions.