Trade Names:Foscarnet Sodium- Injection 24 mg/mL
Inhibits replication of all known herpes viruses, including cytomegalovirus (CMV), herpes simplex virus types 1 and 2 (HSV-1, HSV-2), human herpes virus 6 (HHV-6), Epstein-Barr virus (EBV) and varicella-zoster virus (VZV).
C max is about 589 to 623 mcmol. C min is about 63 to 114 mcmol.
Protein binding is 14% to 17%. The drug deposits into the bone. Vd is about 0.41 to 0.52 L/kg.
Terminal t 1/ 2 is about 87.5 h. Systemic clearance is about 6.2 to 7.1 L/h and Cl R is about 5.6 to 6.4 L/h. Plasma t 1/ 2 is about 4 h.
Ccr of 50 to 80 mL/min has a Cl of about 1.33 mL/min/kg and a plasma t 1/ 2 of about 3.35 h. Ccr of 25 to 49 mL/min has a Cl of about 0.46 mL/min/kg and a plasma t 1/ 2 of about 13 h. Ccr of 10 to 24 mL/min has a Cl of 0.43 mL/min/kg and plasma t 1/ 2 about 25.3 h.
Treatment of CMV retinitis in patients with AIDS; treatment of acyclovir-resistant mucocutaneous HSV infections in immunocompromised patients; combination therapy with ganciclovir for patients who have relapsed after monotherapy with either drug.
60 mg/kg/dose at constant rate over at least 1 h every 8 h for 2 to 3 wk. Adjust for clinical response and renal function.Maintenance dose
90 mg/kg/day infused over 2 h, individualized; max maintenance dose is 120 mg/kg/day.HSV InfectionsAdults
40 mg/kg/dose (min, 1 h infusion) every 8 or 12 h for 2 to 3 wk or until healed.Maintenance
90 mg/kg/day given as an IV infusion over 2 h, individualized; max maintenance dose is 120 mg/kg/day.
Use prepared solutions within 24 h of first entry into sealed bottle.
Elimination of foscarnet may be impaired by drugs that inhibit renal tubular secretion. Increased potential for nephrotoxicity with aminoglycosides, amphotericin B, and IV pentamidine.Pentamidine
Concomitant IV pentamidine may cause hypocalcemia.Zidovudine
Increased risk of anemia.
Do not give other drugs or supplements via same IV catheter.
None well documented.
Hypertension; palpitations; ECG abnormalities including sinus tachycardia, first-degree heart block, nonspecific ST-T segment changes; hypotension; flushing; cerebrovascular disorder.
Headache; paresthesia; dizziness; involuntary muscle contractions; hypoesthesia; neuropathy; seizures; depression; confusion; anxiety; tremor; ataxia; dementia; stupor; generalized spasms; sensory disturbances; meningitis; aphasia; abnormal coordination; leg cramps; EEG abnormalities; insomnia; somnolence; nervousness; amnesia; agitation; aggressive reaction; hallucination.
Rash; increased sweating; pruritus; skin ulceration; seborrhea; erythematous or maculopapular rash; skin discoloration; facial edema.
Vision abnormalities; eye pain; conjunctivitis; sinusitis; rhinitis; taste perversions; pharyngitis.
Anorexia; nausea; diarrhea; vomiting; abdominal pain; constipation; dysphagia; dyspepsia; rectal hemorrhage; dry mouth; melena; flatulence; ulcerative stomatitis; pancreatitis.
Alterations in renal function, including decreased Ccr, abnormal renal function; albuminuria; dysuria; polyuria; urethral disorder; urinary retention; UTI; acute renal failure; nocturia; abnormal albumin-globulin ratio; increased AST and ALT.
Anemia; bone marrow suppression; granulocytopenia; leukopenia; thrombocytopenia; platelet abnormalities; thrombosis; WBC abnormalities; lymphadenopathy.
Mineral and electrolyte imbalances, including hypo- or hypercalcemia, hypokalemia, hypomagnesemia, hypo- or hyperphos-phatemia, hyponatremia; decreased weight; increased alkaline phosphatase, LDH, BUN; acidosis.
Coughing; dyspnea; pneumonia; respiratory disorders or insufficiency; pulmonary infiltrates; stridor; pneumothorax; hemoptysis; bronchospasm.
Fever; fatigue; rigors; asthenia; malaise; arthralgia or myalgia; cachexia; thirst; infection; sepsis; death; back or chest pain; edema; influenza-like symptoms; abscess; lymphoma-like disorders; sarcoma; injection site pain or inflammation.
Major toxicity. Frequent serum creatinine monitoring with dose adjustments for changes in renal function and adequate hydration is essential.
Seizures related to levels of minerals and electrolytes. May require supplementation.
Category C .
Safety and efficacy not studied. Drug is deposited in teeth and bone.
If Ccr drops below 0.4 mL/min/kg, discontinue drug. Ensure that baseline renal function tests have been obtained before beginning therapy, and repeat 2 to 3 times/wk during induction therapy and 1 to 2 times/wk during maintenance therapy.
Patients, especially those on concomitant drugs known to influence serum minerals or electrolytes or those with cardiac or neurological abnormalities, may experience changes in electrolytes (eg, calcium, potassium, magnesium, phosphate) that could cause cardiac disturbances or seizures. Replacement therapy may be needed.
Ensure that baseline serum electrolyte levels (eg, calcium, magnesium, potassium, phosphate) have been obtained before beginning therapy, and repeat 2 to 3 times/wk during induction therapy and 1 to 2 times/wk during maintenance therapy.
If symptoms of electrolyte imbalance occur, infusion may need to be discontinued and electrolyte supplementation initiated.
Infuse into veins with adequate blood flow to permit rapid dilution and distribution and avoid local irritation. Drug is excreted in urine and may cause irritation or ulceration of penile or vulvovaginal epithelium.
Electrolyte disturbances, paresthesia, renal dysfunction, seizures, coma.
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