Caspofungin
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| Pronunciation | /ˌkæspoʊˈfʌndʒɪn/ KAS-poh-FUN-jin | 
| Trade names | Cancidas | 
| Other names | (4R,5S)-5-[(2-Aminoethyl)amino]-N2-(10,12-dimethyltetradecanoyl)- 4-hydroxy-L-ornithyl-L-threonyl-trans-4-hydroxy-L-prolyl-(S)-4-hydroxy-4-(p-hydroxyphenyl)-L-threonyl-threo-3-hydroxy-L-ornithyl-trans-3-hydroxy-L-proline cyclic (6→1)-peptide : 185 1-[(4R,5S)-5-[(2-Aminoethyl)amino]-N2-(10,12-dimethyl-1-oxotetradecyl)-4-hydroxy-L-ornithine]-5-[(3R)-3-hydroxy-L-ornithine] pneumocandin B0 | 
| AHFS/Drugs.com | Monograph | 
| MedlinePlus | a615001 | 
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| Pregnancy category | 
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| Routes of administration | Intravenous | 
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| Pharmacokinetic data | |
| Bioavailability | 100% (intravenous use only) | 
| Protein binding | ~97% | 
| Metabolism | Peptide hydrolysis, N-acetylation | 
| Elimination half-life | 9–11 hours | 
| Excretion | Kidney (41%), feces (35%) | 
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| Chemical and physical data | |
| Formula | C52H88N10O15 | 
| Molar mass | 1093.331 g·mol−1 | 
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| (what is this?) | |
Caspofungin (INN; brand name Cancidas) is a lipopeptide antifungal drug from Merck & Co., Inc. It is a member of a 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. It is on the World Health Organization's List of Essential Medicines.