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Biomedical subjects

S O Waife

Publications and source records attributed to S O Waife.

6 recordsLinked to original sources

From DNA to NDA--the impact of recombinant DNA technology on new drug development.

Man's long-standing efforts to alter living things through genetic manipulation have become reality. Recent advances in recombinant DNA technology have the potential to alter the drug-development process profoundly. The pharmaceutical industry has had to adjust its research efforts and develop new state-of-the-art laboratories. In addition to the standard biological and in vivo assays, many new tests are required, e.g., amino acid sequencing, high-pressure liquid chromatography, and radioimmunoassays. Academic researchers have played a vital role in developing the new biotechnology, supplying most of the basic scientific knowledge and the initial supply of the scientific work force. The recent shifting of support for scientific training from the government to the pharmaceutical industry has resulted in unprecedented academe-industry relationships. Universities now stand to profit significantly from patent rights resulting from biotechnology research efforts. While the advances in biotechnology have had considerable impact on the pharmaceutical industry and academia, they have thus far had only a minor impact on the regulatory process. To date, the preferred regulatory path appears to be modification of existing procedures through the issuance of guidelines, which can be updated as knowledge increases.

Academies and Institutes↗

Analgesia, plasma levels, and dosage of propoxyphene.

It can be shown that both the mean plasma levels observed and the mean analgesic scores (effectiveness) are related to the dose of an orally effective analgesic agent, although wide individual variations exist. Based on the pharmacokinetic characteristics of propoxyphene, it can be predicted and confirmed that equilibrium (or steady state) plasma levels will be achieved after about six doses when administered on a q. 6h. schedule. Similar predictions indicate that an initial loading dose of 2 to 2 1/2 times the maintenance dose will produce more promptly plasma levels within or close to the equilibrium levels.

Analgesia↗

Problems and solutions to single-dose testing of analgesics: comparison of propoxyphene, codeine, and fenoprofen.

Discrepancies exist between reports arising from single-dose and multiple-dose studies intended to compare the efficacy of oral analgesics. D Differences in the pharmacokinetic characteristics of these drugs account for much of the discord. Codeine and fenoprofen rapidly achieve their ultimate plasma equilibrium levels (on a q. 6h. schedule), whereas, propoxyphene requires a longer period, doubtless due to its longer half-life and proportionately smaller maintenance dose. If the drugs are not to be compared during the steady state, then administration of appropriate loading doses permits satisfactory single dose comparisons at steady-state concentrations.

Analgesics↗