Related by context. Frequent words. (Click for all words.) 55 Oxytocin 53 dopamine receptors 53 emotional arousal 53 nucleus accumbens 52 Dopamine 52 neurochemical 52 anandamide 52 Opioids 52 Oestrogen 52 Endorphins 52 Naltrexone 51 baclofen 51 releases endorphins 51 Anti depressants 50 Nicotine 50 hormone oxytocin 50 neurotransmitter serotonin 50 dopamine 50 opioid receptors 50 suppresses appetite 50 vasodilator 50 relaxant 50 Flibanserin 50 Cortisol 50 endocannabinoid system 49 dopamine receptor 49 Tryptophan 49 partial agonist 49 theobromine 49 oxytocin 49 noradrenaline 48 chemical serotonin 48 neurotransmitter dopamine 48 Antidepressants 48 Sildenafil 48 chemical dopamine 48 ventral striatum 48 endocannabinoids 48 dopamine agonists 48 anxiety insomnia 48 Hyperactivity 47 MAO B 47 Opiates 47 Buprenorphine 47 Progesterone 47 Antihistamines 47 platelet activation 47 Hypothyroidism 47 homeostatic 47 Cortisone 46 Quercetin 46 norepinephrine 46 brain derived neurotrophic 46 synaptic plasticity 46 serotonergic 46 serotonin 46 cataplexy 46 Serotonin 46 neurochemistry 46 Erectile Dysfunction 46 Capsaicin 46 neuropeptide 46 PDE5 46 reuptake 46 Ghrelin 46 neurotransmitters 46 glucocorticoid 45 Opioid 45 pharmacologically 45 Antabuse 45 cannabinoid receptors 45 theophylline 45 Hormone 45 reactivity 45 Essential oils 45 stimulation 45 acamprosate 45 protein kinase C 45 cholinergic 45 Vitamin B6 45 Menstrual 45 orexin 45 Cognitive behavioral therapy 45 limbic system 45 neurotransmitter 45 biochemical pathway 45 manic depressive illness 45 vasopressin 45 Glutamate 45 glutamate receptors 45 hydralazine 44 vasodilation 44 analgesic 44 overstimulation 44 Choline 44 Campral 44 PMDD 44 cannabinoid 44 overactivity 44 Morphine 44 dopaminergic