title: Meloxicam does not affect the antiplatelet effect of aspirin in healthy male and female volunteers.
abstract: This study determined if meloxicam, a selective cyclooxygenase (COX)-2 inhibitor, interferes with the antiplatelet effect of aspirin using platelet aggregation and thromboxane (Tx) B(2) endpoints in healthy volunteers. Eight male and 8 female volunteers participated in this open-label, randomized, two-treatment, two-way crossover trial. Treatment 1 was meloxicam (15 mg qd) over 4 days, and then aspirin (100 mg qd) was ingested 2 hours after meloxicam for an additional 7 days. Blood samples were taken 2, 6, and 24 hours after the last dose. Treatment 2 consisted of only aspirin (100 mg) over 2 days. Samples were taken at the same time points. Each subject received both treatments with a 2-week washout between the treatment periods. Treatments were safe and well tolerated. The initial 4-day treatment with meloxicam had no effect on platelet aggregation but reduced serum TxB(2) by 64% +/- 19%. Addition of aspirin (100 mg qd) for 7 days resulted in complete inhibition of aggregation and TxB(2) for 24 hours. Two-day treatment with only 100 mg aspirin also resulted in complete inhibition of platelet aggregation and TxB(2). These results indicate that meloxicam does not affect the ability of aspirin to inhibit COX-1 in platelets, thereby allowing aspirin to effectively prevent platelet aggregation and reduce TxB(2) levels, and that meloxicam is selective for COX-2.
authors.affiliation: Boehringer Ingelheim Pharma GmbH and Co. KG, Birkendorfer Str. 65, 88397 Biberach, Germany.
authors.forename: Joanne
authors.initials: J
authors.lastname: Van Ryn
authors.forename: Monika
authors.initials: M
authors.lastname: Kink-Eiband
authors.forename: Ingrid
authors.initials: I
authors.lastname: Kuritsch
authors.forename: Ulrich
authors.initials: U
authors.lastname: Feifel
authors.forename: Gertraud
authors.initials: G
authors.lastname: Hanft
authors.forename: Gudrun
authors.initials: G
authors.lastname: Wallenstein
authors.forename: Guenter
authors.initials: G
authors.lastname: Trummlitz
authors.forename: Michel
authors.initials: M
authors.lastname: Pairet
mesh_terms: D000328:Adult; D001241:Aspirin / Q000494:pharmacology*; D018592:Cross-Over Studies; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D004347:Drug Interactions; D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000037:antagonists & inhibitors; D008297:Male; D000077239:Meloxicam; D008565:Membrane Proteins; D008875:Middle Aged; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D011451:Prostaglandin-Endoperoxide Synthases; D013843:Thiazines / Q000494:pharmacology*; D013844:Thiazoles / Q000494:pharmacology*; D013929:Thromboxane B2 / Q000097:blood
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D008565:Membrane Proteins; D010975:Platelet Aggregation Inhibitors; D013843:Thiazines; D013844:Thiazoles; D013929:Thromboxane B2; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D001241:Aspirin; D000077239:Meloxicam