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The half-life of venlafaxine is relatively short, so patients are directed to adhere to a strict medication routine, avoiding missing a dose. Even a single missed dose can result in withdrawal symptoms. [86] Venlafaxine is a substrate of P-glycoprotein (P-gp), which pumps it out of the brain.
An equianalgesic chart can be a useful tool, but the user must take care to correct for all relevant variables such as route of administration, cross tolerance, half-life and the bioavailability of a drug. [5] For example, the narcotic levorphanol is 4–8 times stronger than morphine, but also has a much longer half-life. Simply switching the ...
The half-life of venlafaxine is about 5 hours, and with once-daily dosing, steady-state concentration is achieved after about 3 days, though its active metabolite desvenlafaxine lasts longer. [59] The half-life of desvenlafaxine is about 11 hours, and steady-state concentrations are achieved after 4 to 5 days. [58]
[181] [182] Discontinuation effects appear to be less for fluoxetine, perhaps owing to its long half-life and the natural tapering effect associated with its slow clearance from the body. One strategy for minimizing SSRI discontinuation symptoms is to switch the patient to fluoxetine and then taper and discontinue the fluoxetine.
Absorption half-life 1 h, elimination half-life 12 h. Biological half-life (elimination half-life, pharmacological half-life) is the time taken for concentration of a biological substance (such as a medication) to decrease from its maximum concentration (C max) to half of C max in the blood plasma.
Relative to other SNRIs, levomilnacipran, as well as milnacipran, differ in that they are much more balanced reuptake inhibitors of serotonin and norepinephrine. [12] [13] [14] To demonstrate, the serotonin:norepinephrine ratios of SNRIs are as follows: venlafaxine = 30:1, duloxetine = 10:1, desvenlafaxine = 14:1, milnacipran = 1.6:1, and levomilnacipran = 1:2. [12]
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Venlafaxine has also been implicated to create withdrawal symptoms regardless of dosage. [15] Venlafaxine has been implicated in causing the most severe withdrawal symptoms after cessation of use, possibly due to its short half-life. [16] To simplify identifying the principal signs and symptoms, the mnemonic FINISH may be used: Flu-like ...