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15 Cards in this Set
- Front
- Back
Aspects of sexuality affected by drugs
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Libido (sex drive)
Sensation Performance -men (erections, orgasm, ejaculation) -females (lubrication, orgasm) |
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Libido - effect of hormones
-which hormones increase libido? -which decrease? |
Increase
-testosterone (both sexes) -estrogen (females) Decrease -prolactin (both sexes) -estrogen (males) |
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Libido - effect of CNS NTs
-DA -ACh -NE -Serotonin |
DA increases sex drive (antagonists would decrease)
Muscarinic antagonists decrease libido alpha-2 block increases libido; beta-antagonists, alpha-2 agonists decrease libido Increased serotonin decreases libido |
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Role of peripheral NS in sexual response
-Parasympathetic -Sympathetic -Somatic nerves |
Males
-parasympathetic --> erection -sympathetic --> ejaculation -somatic --> ejaculation/orgasm -------------------------------------- Females -parasympathetic --> clitoris erection, lubrication -sympathetic --> contraction of uterus, fallopian tubes, vagina -somatic --> orgasm |
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Effects of Antihypertensive Drugs
-ganglionic blockers -beta blockers -alpha-1 blockers -clonidine, methyldopa |
Affects men only
Ganglionic blockers -complete failure of erection, orgasm Beta blockers -ED, loss of libido Alpha-1 blockers -can get erection but have ejaculatory failure Clonidine, methyldopa -interfere with orgasm, ED |
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Effects of Antihypertensive Drugs Cont'd
-thiazides -spironolactone -ca-channel blockers -ACE inhibitors |
Thiazides
-impotence (ED) Spironolactone -decreased libido (increased prolactin, decreased testosterone) Few problems w/ Ca-channel blockers and ACE inhibitors |
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Antipsychotics
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Decreased libido due to:
-DA receptor blockade -CNS anticholinergic effects -CNS sedative effects ED - peripheral anticholinergic Orgasm problems - peripheral alpha-1 block |
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Tricyclics (TCAs)
SSRIs MAOIs Levodopa |
impotence, decreased lubrication (anticholinergic), impaired orgasm (alpha-1)
-------------------------------------- decreased libido, difficulty w/ orgasm -------------------------------------- orgasm difficulty, ejaculatory failure -------------------------------------- enhanced libido |
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Alcohol/CNS depressants
-acute and chronic |
Acute
-disinhibiting, increased libido, impotence, delayed/less orgasm Chronic -impotence, decreased testosterone --> lower libido and loss of secondary sex characteristics |
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Marijuana
-acute and chronic |
Acute
-enhanced sensory, disinhibition (lower doses), impotence/anxiety (higher doses) Chronic -decreased spermatogenesis, testosterone (libido, ED) -irregular menstruation |
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Cocaine and Amphetamines
-acute and chronic |
Acute
-enhanced libido (DA), delayed orgasm (lower doses); high doses stimulate erection, ejaculation, anxiety Chronic -loss of libido, depression, ejaculatory failure |
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Opioids
-acute and chronic |
Acute
-increased sexual activity (disinhibition) Chronic -decrease in sexual activity |
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Psychedelics
-LSD, mescaline -MDA/MMDA -PCP |
LSD/mescaline
-enhance sensory MDA/MMDA -enhance sexual feelings PCP -can inhibit sensation -depression and psychosis w/ chronic use |
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Prostaglandin E1
-use and MOA -forms (admin) -side effects |
Use for ED
PG binds receptors on surface of corpora cavernosa smooth muscle cell --> increase cAMP --> increase PKA --> decrease Ca2+ --> smooth muscle relaxation --> vasodilation -------------------------------------- drug of choice before Viagra injectable and urethral suppository forms Side effects - hypotension, mild penile pain, priaprism |
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Sildenafil (Viagra)
-use -MOA -kinetics -adverse effects |
Use for ED, NOT libido
NO increases guanylate cyclase --> increases cGMP --> smooth muscle relaxation -sildenafil inhibits PDE-5 which breaks down cGMP --> elevated cGMP -------------------------------------- Peak plasma concentrations at 1 hr, 4 hr 1/2 life = effective duration -------------------------------------- Hypotension, headache, flushing Visual disturbance - non-arteritic ischemic optic neuropathy Hearing loss (and vestibular dysfunction) Dangerous synergy w/ nitrates - caution in pts w/ CV disease |