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Title: Eptapirone  
Author: World Heritage Encyclopedia
Language: English
Subject: Flesinoxan, Befiradol, Quipazine, Adatanserin, F-15,599
Publisher: World Heritage Encyclopedia


Systematic (IUPAC) name
Clinical data
Legal status
  • Uncontrolled
Routes Oral
Pharmacokinetic data
Half-life 2 hours
CAS number
ATC code None
Chemical data
Formula C16H23N7O2 
Mol. mass 345.40 g/mol

Eptapirone (F-11,440) is a very potent and highly selective 5-HT1A receptor full agonist of the azapirone family.[1][2] Its affinity for the 5-HT1A receptor was reported to be 4.8 nM (Ki) (or 8.33 (pKi)), and its intrinsic activity approximately equal to that of serotonin (i.e., 100%).[1]

Eptapirone and related high-efficacy 5-HT1A full and super agonists such as befiradol and F-15,599 were developed under the hypothesis that the maximum exploitable therapeutic benefits of 5-HT1A receptor agonists might not be able to be seen without the drugs employed possessing sufficiently high intrinsic activity at the receptor. As 5-HT1A receptor agonism, based on animal and other research, looked extremely promising for the treatment of depression from a theoretical perspective, this idea was developed as a potential explanation for the relatively modest clinical effectiveness seen with already available 5-HT1A receptor agonists like buspirone and tandospirone, which act merely as weak-to-moderate partial agonists of the receptor.[3][1][2][4][5]

Animal studies

In the Porsolt forced swimming test, eptapirone was found to suppress immobility more robustly than buspirone, ipsapirone, flesinoxan, paroxetine, and imipramine, which was suggestive of strong antidepressant-like effects.[1] In this assay, unlike the other drugs screened, buspirone actually increased the immobility time with a single administration, while repeated administration decreased it, an effect that may have been related to buspirone's relatively weak intrinsic activity (~30%) at the 5-HT1A receptor and/or its preferential activation of 5-HT1A somatodendritic autoreceptors over postsynaptic receptors.[1]

After repeated administration, high dose paroxetine was able to rival the reduction in immobility seen with eptapirone. However, efficacy was seen on the first treatment with eptapirone, which suggested that eptapirone may have the potential for a more rapid onset of antidepressant effectiveness in comparison.[1] Imipramine was unable to match the efficacy of eptapirone or high dose paroxetine, which was probably the result of the fact that higher doses were fatal.[1]

In the conflict procedure, eptapirone produced substantial increases in punished responding without affecting unpunished responding, which was suggestive of marked anxiolytic-like effects.[1] In addition, the efficacy of eptapirone in this assay was more evident than that of buspirone, ipsapirone, and flesinoxan.[1]

Human studies

Eptapirone has been assayed in humans in preclinical trials at an oral dose of 1.5 mg.[6][7] In these studies, eptapirone reduced body temperature, prolonged REM sleep, increased cortisol and growth hormone levels, and produced side effects such as dizziness and drowsiness while being overall well-tolerated.[6][7] It peaked rapidly within 30–60 minutes and had an estimated half-life of two hours, with a total duration of approximately three hours.[6][7]

See also


  1. ^ a b c d e f g h i Koek W, Patoiseau JF, Assié MB, et al. (October 1998). "F 11440, a potent, selective, high efficacy 5-HT1A receptor agonist with marked anxiolytic and antidepressant potential". The Journal of Pharmacology and Experimental Therapeutics 287 (1): 266–83.  
  2. ^ a b Prinssen EP, Colpaert FC, Koek W (October 2002). "5-HT1A receptor activation and anti-cataleptic effects: high-efficacy agonists maximally inhibit haloperidol-induced catalepsy". European Journal of Pharmacology 453 (2-3): 217–21.  
  3. ^ Celada P, Bortolozzi A, Artigas F (September 2013). "Serotonin 5-HT1A receptors as targets for agents to treat psychiatric disorders: rationale and current status of research". CNS Drugs 27 (9): 703–16.  
  4. ^ Koek W, Vacher B, Cosi C, et al. (May 2001). "5-HT1A receptor activation and antidepressant-like effects: F 13714 has high efficacy and marked antidepressant potential". European Journal of Pharmacology 420 (2-3): 103–12.  
  5. ^ Maurel JL, Autin JM, Funes P, Newman-Tancredi A, Colpaert F, Vacher B (October 2007). "High-efficacy 5-HT1A agonists for antidepressant treatment: a renewed opportunity". Journal of Medicinal Chemistry 50 (20): 5024–33.  
  6. ^ a b c Wilson SJ, Bailey JE, Rich AS, et al. (November 2005). "The use of sleep measures to compare a new 5HT1A agonist with buspirone in humans". Journal of Psychopharmacology (Oxford, England) 19 (6): 609–13.  
  7. ^ a b c Wilson SJ, Bailey JE, Nutt DJ (June 2005). "Dizziness produced by a potent 5HT(1A) receptor agonist (eptapirone) is not due to postural hypotension". Psychopharmacology 179 (4): 895–6.  

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