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|Bioavailability||100% (intravenous use only)|
|Elimination half-life||9–11 hours|
|Excretion||Urine (41%), feces (35%)|
|Chemical and physical data|
|Molar mass||1093.31 g/mol|
|3D model (JSmol)|
|(what is this?)|
Caspofungin (INN) (brand name Cancidas worldwide) is a lipopeptide antifungal drug from Merck & Co., Inc. discovered by James Balkovec, Regina Black and Frances A. Bouffard. It is a member of a new class of antifungals termed the echinocandins. It works by inhibiting the enzyme (1→3)-β-D-glucan synthase and thereby disturbing the integrity of the fungal cell wall. Caspofungin was the first inhibitor of fungal (1→3)-β-D-glucan synthesis to be approved by the United States Food and Drug Administration. Caspofungin is administered intravenously.
Caspofungin has been effective in treating fungal infections caused by Aspergillus and Candida species. It is a member of the echinocandin family, a new class of antifungal agents with broad spectrum of activity against all Candida species. In comparison to treatment with either fluconazole or Amphotericin B, all three drugs in this class have been demonstrated to be highly effective or superior in well-defined clinical settings including invasive Candida infections, Candida oesophagitis and candidaemia. Higher minimum inhibitory concentration (MIC) of these agents has been observed against C. parapsilosis and C. guilliermondii.
The following summarizes MIC susceptibility for a few medically significant organisms.
Its currently approved therapeutic indications by both organisations include the empirical therapy of presumed fungal infections in febrile, neutropenic adult patients and for salvage therapy in patients treatment of invasive aspergillosis in adult patients whose disease is refractory to, or who are intolerant of, other antifungal agents (i.e., conventional or lipid formulations of amphotericin B and/or itraconazole). Additionally, the FDA approval includes indication for the treatment of candidemia and some specific Candida infections (intra-abdominal abscesses, peritonitis, pleural cavity infections, and esophagitis) and the EMEA approval includes indication for the treatment of general invasive candidiasis in adult patients.
Slowly metabolized by peptide hydrolysis and N-acetylation in liver. Therefore, in case of liver impairment the dose needs to be reduced. Caspofungin also undergoes spontaneous chemical degradation to an open-ring peptide compound, L-747969. Additional metabolism involves hydrolysis into constitutive amino acids and their derivatives, including dihydroxyhomotyrosine and N-acetyl-dihydroxyhomotyrosine.
About 36% of patients refractory to other therapies responded well to caspofungin therapy, while even 70% of patients intolerant to other therapies were classified as responders. Direct comparative studies to other drugs in the treatment of invasive aspergillosis have so far not been undertaken.
Known hypersensitivity to caspofungin acetate or any other ingredient contained in the formulation contraindicate its use.
The concomitant use of caspofungin and cyclosporine in healthy volunteers led to a more frequent increase of liver enzymes (ALT=SGPT and AST=SGOT) than noted with cyclosporine alone. Combination treatment is only indicated if the potential benefit for the patient outweighs the potential risk.
Dosage reduction in patients with moderately impaired liver function is recommended. No clinical data exist regarding the use of caspofungin in patients with severely impaired liver function.
Reactions due to histamine release (rash, facial swelling, pruritus, sensation of warmth and one case of anaphylaxis) have been seen. Health-care providers should carefully watch for these reactions.
In a few patients with infections caused by Candida albicans, mutants with reduced sensitivity to caspofungin have been noticed. Currently there are no data regarding development of resistance in other fungi than C. albicans.
Caspofungin has been shown in animal studies to have embroyotoxic properties, and therefore has been assigned to class C. It should only be given to pregnant women if the benefit to the mother clearly outweighs the potential risk to her fetus.
The drug is found in the milk of lactating rats, but it is not known whether this is seen in humans. Thus, lactating women should be treated cautiously.
Ordinarily, no dose adjustments are necessary, however, greater sensitivity of some older individuals cannot be ruled out.
Compared to amphotericin B, caspofungin seems to have a relatively low incidence of side effects. In clinical studies and postmarketing reports, the side effects seen in 1% or more of the patients were as follows:
Resistance in C. albicans has been described, but is currently still rare. The mechanism is probably a point mutation in the (1→3)-β-D-glucan synthase gene.
The mean duration of therapy in previous studies was 34 days. Some patients were even healed by a one-day treatment. However, a few patients were treated for as long as 162 days and tolerated the drug well, indicating that longtime use may be indicated and tolerated favourably in complicated cases of aspergillosis. Generally, the duration of treatment is dictated by the severity of the disease, the clinical response, and the improvement of immunocompetence in immunocompromised patients.
An initial dose of 70 mg by intravenous infusion is given followed by 50 mg intravenous daily. If no response is seen or if inducers of caspofungin clearance (see above) are coadministered the daily dose may be increased to 70 mg. An infusion should take approximately 1 hour.