Mirtazapine
Mechanism of Action
Mirtazapine is an antagonist of presynaptic alpha 2-adrenergic autoreceptors and heteroreceptors on both norepinephrine and serotonin presynaptic axons. It is also is a potent antagonist of 5HT2 and 5HT3 receptors. As a result, there is increased NE and 5HT activity, especially increased 5HT activitity at the 5HT1A receptors.
Common Side Effects
Sedation, increased appetite, dizziness, and weight gain.
Metabolism
CYP2D6, CYP1A2, and CYP3A4 are the primary enzymes involved in the metabolism of mirtazapine.
Recreational Drug Interactions
Alcohol, Benzos (Xanax, Valium, Klonopin etc), Opiates (Heroin, Codeine, Vicoden, Oxy etc), Barbituates, Ketamine: The effects of these drugs will be stronger than normal, as they will add to the sedative effects of mirtazapine. CAREFUL and go easy on these drugs and stick to low doses until you are sure how they interact with the mirtazapine.
DXM (Dextremethorphan, Robotussin): Because mirtazapine and DXM are metabolized by some of the same enzymes, this combination is most likely quite dangerous. Avoid taking DXM and mirtazapine together!
MDMA/Ecstasy (includes MDA, MDEA etc): Rolling on mirtazapine is relatively safe. Some people find that they do not roll quite as hard as they usually would, and that they need to take about 1/2 an extra pill to obtain normal effects.
Amphetamines (Methamphetamine, Adderall, Dexedrine), Ritalin (methylphenidate), Cocaine: Using stimulants while on mirtazapine seems to be relatively safe as well. The mirtazapine does not appear to affect the recreational effects of the stimulant (i.e. you will get just as high as you always did).
Hallucinogens (LSD/Acid, psilocybin/Shrooms, Tryptamines – 2-ct-2,DPT, DMT etc, Salvia) Hallucinogens seem to be MUCH stronger in combination with mirtazapine, so please be VERY CAREFUL! A dangerous interaction with shrooms has been observed in one person taking mirtazapine. Please avoid hallucinogens while taking mirtazapine or dose very carefully.