Reference health
Hair Analysis for Pharmaceutical Drugs. II. Effective Extraction and Determination of Sildenafil (Viagra) and Its N-Desmethyl Metabolite in Rat and Human Hair by GC-MS.
8/8 checkable references clean · checked 2026-07-22
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
2 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 8 checked references that resolve
resolves10.1248/bpb.24.59
Hair Analysis for Pharmaceutical Drugs. I. Effective Extraction and Determination of Phenobarbital, Phenytoin and Their Major Metabolites in Rat and Human Hair.
resolves10.1080/004982599238687
Pharmacokinetics and metabolism of sildenafil in mouse, rat, rabbit, dog and man
resolves10.1016/S0378-4347(97)00339-3
Development of an assay for the simultaneous determination of sildenfail (viagra) and its metabolite (UK-103,320) using automated sequential trace enrichment of dialysates and high-performance liquid chromatography
resolves10.1016/S0378-4347(00)00536-3
Narrowbore high-performance liquid chromatography for the simultaneous determination of sildenafil and its metabolite UK-103,320 in human plasma using column switching
resolves10.1016/S0379-0738(00)00256-5
Identification of lorazepam and sildenafil as examples for the application of LC/ionspray-MS and MS–MS with mass spectra library searching in forensic toxicology
resolves10.1248/bpb.18.267
Hair Analysis for Drugs of Abuse. IX. Comparison of Deprenyl Use and Methamphetamine Use by Hair Analysis.
resolves10.1016/0960-894X(96)00323-X
Sildenafil (VIAGRATM), a potent and selective inhibitor of type 5 cGMP phosphodiesterase with utility for the treatment of male erectile dysfunction
The 2 references without a DOI — listed, not checked
no DOI — not checked1) This work was presented at the Annual Meeting of the Pharmaceutical Sciences of Japan at Sapporo in 2001.
no DOI — not checked3) http://www.fda.gov/cder/consumerinfo/viagra/viagraupdate721.htm, July 22 (1998).
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work were clean at the dated check: each resolved to a known work in a public registry, and none
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or importance of the work itself, and nothing about references deposited without a DOI.
checked 2026-07-22 — re-checked daily as this page is visited; titles and statuses come from Crossref and DataCite and are not part of the signed record
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