Nafcillin

DB00607ApprovedInvestigationalSmall moleculePenicillins

Nafcillin is a penicillin derivative antibiotic used to treat susceptible staphylococcal infections. A semi-synthetic antibiotic related to penicillin, Naficillin is a narrow-spectrum beta-lactam antibiotic drug.

Chemical structure of Nafcillin
Mechanism
Curator reviewed · 1 reference
Primary indication
Indicated in the treatment of infections caused by penicillinase-producing staphylococci which have demonstrated susceptibility to the drug.Curator reviewed · 1 structured indication
Formula / weight
C21H22N2O5S · 414.475 g/mol (avg)
First approval
Canada, 1994 · United States, 1984
Also known as
Naphcillin

Resolves to

Structure
InChIKeyGPXLMGHLHQJAGZ-JTDSTZFVSA-NSMILES[H][C@]12SC(C)(C)[C@@H](N1C(=O)[C@H]2NC(=O)C1=C(OCC)C=CC2=CC=CC=C12)C(O)=O
Transporters

What you can answer from here — as of September 23, 2026

5Protein targetsEach mapped to UniProt, with action and pharmacological action
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1TransporterSubstrate / inhibitor direction, not just membership
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1,043Drug interactionsStructured to mechanism, not free text
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17Clinical trialsPhase, status and sponsor resolved per trial
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1Structured indicationCondition, population, route and combination as fields, not prose
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56Marketed productsAcross 2 countries and 19 labellers
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2ATC codesIncluding every combination product, plus 22 drug categories
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17+ReferencesStructured and connected to the statements they support
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Which drugs share a target with Nafcillin, and which of those have an active Phase 3 trial?

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