Annals of the New York Academy of Sciences
September 1, 2000
Rafael de la Torre, Magı́ Farré, P. N. Roset et al.
178 citations
Recreational doses of MDMA (50 to 150 mg) in healthy volunteers cause pupil dilation, increases in systolic and diastolic blood pressure, heart rate, and pupillary diameter. Oral temperature changes are biphasic: a slight decrease at 1 hour followed by increases at 2 and 4 hours. Psychomotor performance shows slight dose-dependent impairment. Plasma cortisol and prolactin concentrations rise markedly. The drug's elimination half-life is about 8-9 hours. Peak drug concentrations and physiological effects occur between 1 and 2 hours and return to baseline 4-6 hours after administration.
Journal of Analytical Toxicology
April 1, 2002
Nieves Pizarro, Jordi Ortuño, Mercè Farré et al.
113 citations
A gas chromatography-mass spectrometry method simultaneously measured MDMA and its metabolites MDA, HMMA, and HMA in plasma and urine from healthy volunteers given 100 mg of MDMA. Samples were hydrolyzed, extracted with solid-phase columns, and analyzed as trifluoroacyl derivatives. Linear calibration covered plasma and urine ranges of 25–400 ng/mL and 250–2000 ng/mL for MDMA and HMMA, and 2.5–40 ng/mL and 100–1000 ng/mL for MDA and HMA. A capillary electrophoresis method using (2-hydroxy)propyl-beta-cyclodextrin as chiral selector resolved enantiomers without derivatization, with linear ranges for each enantiomer of MDMA, MDA, and HMMA. Stereoselective disposition of MDMA and MDA was confirmed, while HMMA showed an enantiomer ratio near 1 and constant over time, contradicting MDMA findings.
Chemical Research in Toxicology
August 2, 2001
Mireia Segura, Jordi Ortuño, Magı́ Farré et al.
105 citations
A new method using strong cation-exchange solid-phase extraction and high-performance liquid chromatography with electrochemical detection was validated for measuring the metabolite 3,4-dihydroxymethamphetamine (HHMA) in plasma and urine. Applied to samples from healthy volunteers given MDMA (ecstasy), HHMA appeared as a major metabolite, with peak plasma concentrations (154.5 microg/L) and overall exposure (AUC 1990.9 microg/L h) similar to those of MDMA itself. Urinary recovery of HHMA over 24 hours accounted for 17.7% of the 100 mg MDMA dose, raising total recovery of MDMA and its metabolites to 58%. The method is accurate and precise for pharmacokinetic studies, and measuring HHMA may help clarify its role in MDMA metabolism and potential neurotoxicity.
Psychopharmacology
July 22, 2017
Kim P. C. Kuypers, Rafael de la Torre, Magı́ Farré et al.
24 citations
MDMA reduced the arousal normally elicited by negative sounds, and this effect was blocked by pre-treatment with ketanserin, a 5-HT2 receptor antagonist, indicating the involvement of the serotonin 2A receptor. The drug did not produce a bias toward emotional or social stimuli in the tasks used. MDMA increased both positive and negative mood ratings and elevated oxytocin plasma concentrations. The reduction in arousal to negative sounds was unrelated to subjective arousal levels. This decrease in defensive arousal may contribute to MDMA's therapeutic effects.
Psychopharmacology
November 16, 2017
Eline Haijen, Magı́ Farré, Rafael de la Torre et al.
9 citations
MDMA impaired verbal memory 90 minutes after administration in a word learning task, replicating earlier findings with the same dose (75 mg). Contrary to expectations, MDMA did not affect endocannabinoid concentrations (anandamide and 2-AG) in blood, and the 5-HT2 receptor blocker ketanserin did not block MDMA-induced memory impairment. Ketanserin alone increased AEA concentrations 180 minutes after administration. The findings suggest that peripherally measured endocannabinoids are not involved in the verbal memory deficit during MDMA intoxication.