induction phase, 5 mg per kilogram intravenously every 12 hours for 14-21 days, the intravenous dose given as a 1 hour infusion
maintenance phase, 5 mg per kg intravenously every day

Stable disease is treated with 1000 mg orally three times daily. Similar dosing is used to prevent disease in high-risk patients, such as those infected with human immunodeficiency virus (HIV) or those with organ transplants.

Ganciclovir is also available in slow-release formulations for insertion into the vitreous of the eye, as treatment for CMV retinitis.

Mechanism of action

Ganciclovir is a synthetic analogue of 2'-deoxy-guanosine. It is first phosphorylated to a deoxyguanosine triphosphate (dGTP) analog. This competitively inhibits the incorporation of dGTP by viral DNA polymerase, resulting in the termination of elongation of viral DNA.

Pharmacokinetics

Absorption of the oral form is very limited - about 5% fasting, about 8% with food. It achieves a concentration in the central nervous system of about 50% of the plasma level. About 90% of plasma ganciclovir is eliminated unchanged in the urine, with a half-life of 2-6 hrs, dependending on renal function (elimination takes over 24 hours in end-stage renal disease).

Side effects

Possible side effects include:

Headache
Rash
Neutropenia
Anemia
Low platelets
Kidney failure
Confusion
Seizures

Read more at Wikipedia.org

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Clinical quiz
From American Family Physician, 2/15/03

Clinical Quiz questions are based on selected articles in this issue. Answers appear in this issue.

American Family Physician has been approved by the American Academy of Family Physicians as having educational content acceptable for Prescribed credit hours. Term of approval covers issues published within one year from the beginning distribution date of January 2003. This issue has been reviewed and is acceptable for up to 3 Prescribed credit hours. Credit may be claimed for one year from the date of this issue. When reporting CME credit hours, AAFP members should report total Prescribed credit hours earned for this activity. It is not necessary for members to label credit hours as evidence-based or Prescribed for CME reporting purposes.

The American Academy of Family Physicians is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians.

The AAFP designates this educational activity for a maximum of 3 hours in Category 1 credit toward the American Medical Association Physician's Recognition Award. Each physician should claim only those hours of credit that he or she actually spent in the educational activity.

AAFP Credit

Each copy of AFP contains a Clinical Quiz answer card. AAFP members may use this card to obtain the designated number of Prescribed credit hours for the year in which the card is postmarked.

AMA/PRA Category 1 Credit

AAFP members who satisfy the Academy's continuing medical education requirements are automatically eligible for the AMA/PRA.

Physicians who are not members of the AAFP are eligible to receive the designated number of credit hours in Category 1 of the AMA/PRA on completion and return of the Clinical Quiz answer card. AFP keeps a record of AMA/PRA Category 1 credit hours for nonmember physicians. This record will be provided on request; however, nonmembers are responsible for reporting their own Category 1 CME credits when applying for the AMA/PRA or other certificates or credentials.

For health care professionals who are not physicians and are AFP subscribers, a record of CME credit is kept by AAFP and will be provided to you on written request. You are responsible for reporting CME hours to your professional organization.

NOTE: The full text of AFP is available online (www.aafp.org/afp), including each issue's Clinical Quiz. The table of contents for each online issue will link you to the Clinical Quiz. Just follow the online directions to take the quiz and, if you're an AAFP member, you can submit your answers for CME credit.

INSTRUCTIONS

Read each article, answer all questions on the quiz pages, and transfer your answers to the Clinical Quiz answer card (bound into your copy of AFP). This will help you avoid errors and permit you to check your answers against the correct answers.

A Mail the Clinical Quiz answer card within one year (by February 29, 2004). The bar code on the answer card contains your identification for CME credit hours.

Before beginning the test, please note: Each Clinical Quiz includes two types of questions: Type A and Type X.

Type A questions have only one correct answer and may have four or five choices. Here is a typical Type A question:

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