Caffeine Flashcards

1
Q

High absorption from

A

oral doses

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2
Q

Caffeine half life

A

~ 4 hour

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3
Q

caffeine is a

A

Stimulant and anxiogenic

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4
Q

caffeine structure

A

xanthine alkyloid

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5
Q

Caffeine is structurally analogous
to the neuromodulator

A

adenosine

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6
Q
  • Related xanthines are
    found in
A

many plants

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7
Q

Behavioural effects of caffeine - In animals caffeine has a

A

biphasic effect

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8
Q

In animals caffeine has a biphasic effect

A

Increased locomotion at low dose
Decreased locomotion at high dose

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9
Q

In blinded studies vs placebo caffeine (in abstinent coffee drinkers)

A

increased alertness
and decreased tension,
decreased reaction times

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10
Q

Therapeutic uses of caffeine - OTC analgesics

A
  • Caffeine has been shown
    effective at treatment for nonmigraine headache
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11
Q

Therapeutic uses of caffeine - * Apneic episodes in newborns

A

Periodic cessation of breathing,
common in premature infants -Principal treatment is caffeine or
theophylline

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12
Q

caffeine TOLERANCE

A

Tolerance develops to some subjective effects of caffeine

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13
Q

Acute tolerance allows one to

A

o fall asleep after a late-night
cup of coffee

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14
Q

Physiological and psychological symptoms of
withdrawal

A

Headache, lethargy, fatigue
Impaired psychomotor performance
Mild anxiety or depression

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15
Q
  • If abstinent withdrawal may last a
A

a few days before
dissipating

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16
Q

DEPENDENCE

A

Caffeine can excite the mesolimbic DA pathway but
only at very high doses

17
Q

dependence doses

A
  • 5-10 X above ‘normal’ doses
18
Q

DEPENDENCE is

A

Well demonstrated but considered relatively harmless

19
Q

Behavioural / psychological dependence (not
pharmacological) plays a significant role in

A

reinforcing
effects of caffeine

20
Q

Most chronic coffee drinking is to provide

A

relief of
withdrawal

21
Q

Withdrawal from caffeine
induces

A

transient
subjective effects

22
Q

caffeine - placebo - caffeine (headache)

A

reduced headache in caffeine - increased headache immediately after during placebo phase reduced after 2 days - reduced headache during caffeine

23
Q

caffeine - placebo - caffeine (concentration)

A

high levels of concentration - initial decline following by increase - further increase

24
Q

caffeine - placebo - caffeine (lethargy)

A

low levels of lethargy - initial increase followed by decrease - further decrease

25
caffeine - placebo - caffeine (energy)
increased energy - initial decrease followed by increase - increased energy
26
Biochemical effects - Caffeine acts at many sites in the CNS including
GABAA receptors and eliciting Ca2+ -release within cells
27
Caffeine acts at many sites in the CNS including GABAA receptors and eliciting Ca2+ -release within cells, but most likely exerts stimulant effects by
antagonising adenosine receptors.
28
Adenosine is elevated in the cat brain after periods of long
wakefulness (sleep deprivation) and is suggested to signal increased sleep pressure
29
Blockade of adenosine receptors reduces
drowsiness.
30
Adenosine
Among other roles, adenosine provides inhibitory input to ascending arousal systems
31
Adenosine Inhibitory at multiple sites in the
hypothalamus
32
Adenosine Inhibitory at multiple sites in the hypothalamus
* Suprachiasmic nuclei (SCN) * Lateral hypothalamus (LHA) * Preoptic areas (MnPO, VLPO)
33
Adenosine release inhibits
arousal and increases sleep pressure