insomnia
12 interactions related to insomnia
propranolol + melatonin
Propranolol blocks pineal beta-1 adrenergic receptors that control endogenous melatonin synthesis, suppressing nighttime melatonin levels by roughly 50% and contributing to insomnia, vivid dreams, and reduced sleep efficiency. Low-dose oral melatonin at bedtime can restore sleep architecture without compromising propranolol's antihypertensive effect.
lemon balm + valerian
Lemon balm (Melissa officinalis) and valerian (Valeriana officinalis) both modulate the GABAergic system but through different mechanisms — valerian's valerenic acid acts directly on GABA-A receptors while lemon balm's rosmarinic acid inhibits GABA transaminase to preserve GABA in the synapse — and the combination has been studied for restlessness, dyssomnia, and sleep quality.
diphenhydramine + valerian
Diphenhydramine (a sedating antihistamine) and valerian root both produce CNS depression through GABAergic and histaminergic pathways. Used together, sedation, psychomotor impairment, and respiratory depression risks are additive.
metoprolol + melatonin
Metoprolol blocks the beta-1 adrenergic receptors that drive pineal melatonin synthesis, suppressing endogenous nighttime melatonin and contributing to insomnia, vivid dreams, and reduced sleep efficiency. Low-dose oral melatonin can restore sleep without interfering with metoprolol's cardiovascular benefits.
melatonin + magnesium
Melatonin signals the brain that it is biological night through MT1 and MT2 receptors in the suprachiasmatic nucleus, while magnesium acts as a NMDA antagonist and GABA-A agonist, helping the nervous system actually relax around that signal. A double-blind RCT in nursing home residents with primary insomnia (Rondanelli 2011) found that nightly melatonin 5 mg + magnesium 225 mg + zinc 11.25 mg significantly improved sleep quality, ease of falling asleep, and morning alertness versus placebo.
trazodone + 5-htp
Both trazodone and 5-HTP increase central serotonin activity. Trazodone blocks the serotonin transporter and acts on 5-HT2 receptors, while 5-HTP is a direct precursor to serotonin and bypasses the normal regulation of tryptophan availability. Combining them can produce additive serotonergic effects and risk of serotonin syndrome.
caffeine + sertraline
Sertraline and caffeine can each contribute to anxiety, insomnia, tremor and GI upset, and sertraline may modestly slow caffeine clearance via CYP1A2 inhibition. The pharmacokinetic effect is small but the additive symptomatic effect can be uncomfortable.
smoking + caffeine
Polycyclic aromatic hydrocarbons in tobacco smoke induce CYP1A2, the enzyme that performs about 95% of caffeine demethylation, raising caffeine clearance by 40-65% and shortening its half-life from roughly 6 hours to 3.5 hours in smokers. Quitting smoking can cause caffeine levels to rise sharply, contributing to jitters, anxiety, palpitations, and insomnia.
coffee + sertraline
Sertraline modestly inhibits CYP1A2-mediated caffeine metabolism, raising caffeine plasma levels and prolonging its half-life. Caffeine can also worsen the anxiety, insomnia, jitteriness, and palpitations that sertraline is often prescribed to treat, blunting the clinical response.
diphenhydramine + melatonin
Both diphenhydramine and melatonin cause sedation through different mechanisms (H1 antagonism and MT1/MT2 agonism). Combined use produces additive CNS depression, next-day drowsiness, impaired cognition, and increased fall risk, especially in older adults.
caffeine + oral contraceptives
Ethinyl estradiol in oral contraceptives inhibits CYP1A2, the enzyme that metabolizes caffeine. This roughly doubles caffeine's area-under-the-curve and prolongs its half-life, intensifying jitteriness, insomnia and palpitations.
hot chocolate + sleep medications
Hot chocolate contains caffeine and theobromine, methylxanthines that antagonize adenosine receptors. Because zolpidem, eszopiclone, benzodiazepines, and other sedatives work in part by amplifying inhibitory neurotransmission, evening hot chocolate can partially blunt their sedative effect and worsen sleep onset and maintenance.