Studies in animals have shown TOLECTIN (tolmetin sodium) to possess anti-inflammatory, analgesic, and antipyretic activity. In the rat, TOLECTIN prevents the development of experimentally induced polyarthritis and also decreases established inflammation.

The mode of action of TOLECTIN is not known. However, studies in laboratory animals and man have demonstrated that the anti-inflammatory action of TOLECTIN is not due to pituitary- adrenal stimulation. TOLECTIN inhibits prostaglandin synthetase in vitro and lowers the plasma level of prostaglandin E in man. This reduction in prostaglandin synthesis may be responsible for the anti-inflammatory action. TOLECTIN does not appear to alter the course of the underlying disease in man.

  
In patients with rheumatoid arthritis and in normal volunteers, TOLECTIN is rapidly and almost completely absorbed with peak plasma levels being reached within 30 to 60 minutes after an oral therapeutic dose. In controlled studies, the time to reach peak tolmetin plasma concentration is approximately 20 minutes longer following administration of a 600 mg tablet, compared to an equivalent dose given as 200 mg tablets. The clinical meaningfulness of this finding, if any, is unknown. Tolmetin displays a biphasic elimination from the plasma consisting of a rapid phase with a half-life of 1 to 2 hours followed by a slower phase with a half-life of about 5 hours. Peak plasma levels of approximately 40 mcg/mL are obtained with a 400 mg oral dose. Essentially all of the administered dose isrecovered in the urine in 24 hours either as an inactive oxidative metabolite or as conjugates of tolmetin. An 18-day multiple- dose study demonstrated no accumulation of tolmetin when compared with a single dose. 

In two fecal blood loss studies of 4 to 6 days duration involving 15 subjects each, TOLECTIN did not induce an increase in blood loss over that observed during a 4-day drug free control period. In the same studies, aspirin produced a greater blood loss than occurred during the drug free control period, and a greater blood loss than occurred during the TOLECTIN treatment period. In one of the two studies, indomethacin produced a greater fecal blood loss than occurred during the drug free control period; in the second study, indomethacin did not induce a significant increase in blood loss.

  
TOLECTIN is effective in treating both the acute flares and in the long-term management of the symptoms of rheumatoid arthritis, osteoarthritis and juvenile rheumatoid arthritis. 

In patients with either rheumatoid arthritis or osteoarthritis, TOLECTIN is as effective as aspirin and indomethacin in controlling disease activity, but the frequency of the milder gastrointestinal adverse effects and tinnitus was less than in aspirin-treated patients, and the incidence of central nervous system adverse effects was less than in indomethacin-treated patients.

  
In patients with juvenile rheumatoid arthritis, TOLECTIN is as effective as aspirin in controlling disease activity, with a similar incidence of adverse reactions. Mean SGOT values, initially elevated in patients on previous aspirin therapy, remained elevated in the aspirin group and decreased in the TOLECTIN group. 

  
TOLECTIN has produced additional therapeutic benefit when added to a regimen of gold salts and, to a lesser extent, with corticosteroids. TOLECTIN should not be used in conjunction with salicylates since greater benefit from the combination is not likely, but the potential for adverse reactions is increased.