Can You Take Magnesium Glycinate with Xanax During a Benzodiazepine Taper?

Usually yes, as long as the prescriber knows.

Most patients tapering Xanax (alprazolam) can take magnesium glycinate. The alprazolam label lists no interaction with magnesium, and Dr. Mark Leeds, an osteopathic physician and deprescribing specialist in Fort Lauderdale, Florida, does not expect one. The conditions are a prescriber who knows, healthy kidneys, and a medication list that has been checked.

What magnesium is not is a taper tool. It does not lower the dose, it does not let a reduction happen sooner, and it does not replace a plan. A supplement can sit beside a taper. It cannot carry one.

Needing a taper does not mean addiction.

Most people asking this question took alprazolam exactly as prescribed, often for years, and found that a missed or reduced dose brought symptoms. That is physical dependence, a condition the medication itself creates, and dependence is not addiction. The United States Food and Drug Administration (FDA) said as much in its September 2020 boxed-warning update for the whole benzodiazepine class: physical dependence can occur when the drug is taken steadily for several days to weeks, even as prescribed.

The treatment that fits the condition is a gradual, medically supervised taper over months, sometimes longer. Nothing about magnesium changes that.

There is no “Xanax tapering with magnesium” method.

Some pages describe magnesium as a tapering method. No such protocol exists in the Ashton Manual, the Maudsley Deprescribing Guidelines, or the alprazolam label, and magnesium is at most a side question the prescriber can say yes or no to.

Magnesium does not strengthen alprazolam, and it does not stand in for a missed dose. So, a patient who feels better after starting it has no reason to skip a dose or shorten a hold. The pace of the taper is set by how the nervous system is coping, and by nothing else.

Xanax is hard to taper because it is short-acting.

Alprazolam has a mean elimination half-life of about eleven hours, according to its label, and Table 1 in Chapter I of the Ashton Manual lists it at six to twelve hours. Between doses the blood level falls far enough for withdrawal to show, and the label has a paragraph headed interdose symptoms, describing early-morning anxiety and anxiety between doses in people taking prescribed maintenance doses. Patients call it interdose withdrawal.

Professor C. Heather Ashton addresses this in Chapter II of the Manual. With relatively short-acting benzodiazepines such as alprazolam and lorazepam, she writes, it is not possible to achieve a smooth decline in blood and tissue concentrations, so the Manual substitutes diazepam (Valium), which is eliminated so slowly that its level falls gradually and evenly. Alprazolam is a handful of dry twigs and diazepam is a log: one flares and is gone in hours, the other burns low and steady for days.

This is the crossover taper, and Schedules 1 and 7 of the Manual walk an alprazolam patient onto diazepam a portion at a time, with the reductions following. The same logic applies to Ativan (lorazepam), with a half-life of ten to twenty hours, and to Klonopin (clonazepam), which lasts eighteen to fifty hours but is still not the drug the Manual tapers with.

The shape of the reduction matters more than any number. Professor Ashton suggests reducing by up to one tenth of the dose at each step, every week or two, and says the patient is usually the best judge of the pace. The Maudsley Deprescribing Guidelines describe hyperbolic reductions, where each step is a fraction of the current dose rather than of the starting dose, so the steps shrink as the dose falls.

Stopping alprazolam abruptly is never the plan. The FDA warns that stopping abruptly or reducing the dosage too quickly can cause withdrawal reactions, from rebound anxiety and insomnia to seizures, which can be life-threatening, and a seizure or any medical emergency is a reason to call emergency services at once. The Manual allows one exception, for the very short-acting sleeping pill triazolam (Halcion), which it says can be stopped abruptly without substituting a long-acting benzodiazepine. Dr. Leeds prefers a gradual taper even there, consistent with that drug’s label, and the exception does not extend to alprazolam.

What magnesium may help, and how thin the evidence is.

The Ashton Manual does not mention magnesium, and neither do the Maudsley Deprescribing Guidelines or the alprazolam label. Evidence for magnesium in benzodiazepine withdrawal is thin, and what follows is clinical experience, which varies from one patient to the next.

Some patients report that sleep comes a little more easily, that muscle tension and night cramps ease, and that constipation improves, because magnesium draws water into the bowel. Others notice nothing at all. None of these effects changes the withdrawal syndrome itself, and none of them shortens a taper.

The mechanism is worth stating correctly. Magnesium’s main action in the nervous system is to sit inside the channel of the N-methyl-D-aspartate (NMDA) glutamate receptor and block it while the cell is at rest. Any effect on gamma-aminobutyric acid (GABA), the system the benzodiazepine works on, is indirect and not well established, so magnesium is not a GABA agonist and does not do the job alprazolam did.

One more correction: benzodiazepines are not known to deplete magnesium. A taper does not create a deficiency that a supplement then repairs.

Glycinate is gentle, citrate is a laxative, oxide is poorly absorbed.

Magnesium glycinate is magnesium bound to the amino acid glycine. Patients usually pick it because glycine has a calming reputation of its own and because the salt is easy on the stomach, with less laxative effect than the other common forms. It is the form Dr. Leeds is most often asked about.

Magnesium citrate is the laxative form. It is cheaper, and absorbed better than oxide, but at supplement amounts it commonly causes loose stools or diarrhea, which suits a patient whose main complaint is constipation and no one else. It is not the form usually chosen for sleep or muscle tension.

Magnesium oxide is the cheapest and the least absorbed. More of it stays in the bowel than reaches the body, so it is more likely to cause loose stools and less likely to do anything else. Magnesium threonate is marketed for the brain at a premium price, and there is no evidence for it in benzodiazepine withdrawal.

Magnesium and Xanax have no dangerous interaction, but there are cautions.

Magnesium is not a sedative, and the alprazolam label lists no interaction with it. Yet, some people do feel sleepy or slowed after a magnesium supplement, and alprazolam causes drowsiness on its own, so on an evening when both happen the drowsiness adds up. New drowsiness, dizziness, or unsteadiness is something to report to the prescriber, not something to assume is harmless, especially for older adults and before driving.

Magnesium binds tetracycline and quinolone antibiotics in the gut and reduces their absorption, so the two are taken hours apart on the pharmacist’s instructions. Some diuretics lower the body’s magnesium and others raise it, and some blood-pressure medicines interact as well, which is why the prescriber needs the full medication list before saying yes.

Kidney disease is the firm caution. The kidneys clear magnesium, and when they cannot keep up it accumulates, causing weakness, low blood pressure, and a slow heart rhythm. Anyone with reduced kidney function should not start a magnesium supplement without their own physician’s agreement.

This article gives no amounts on purpose. The right amount, whether to split it across the day, and whether to take it in the evening for sleep are questions for the prescriber, and loose stools are the usual sign that the amount or the form is wrong.

Herbal products sold for sleep, such as valerian and passionflower, act on the same GABA system as the benzodiazepine and are a different conversation entirely. The rule for magnesium is simpler: tell the prescriber before starting, not after.

Sleep and anxiety during a taper answer to habits as much as to supplements.

Insomnia and anxiety send patients to the supplement aisle, and both respond to ordinary habits. A fixed wake time, screens off well before bed, and caffeine kept small and early do more for sleep than most products on the shelf. Slow breathing, a daily walk, and a quiet hour before bed do the same for anxiety.

None of this cures withdrawal, which eases with time and with a pace the nervous system can follow. Fortunately, when every reduction brings a wave of symptoms, the fix is within reach: a smaller step or a longer hold, agreed with the prescriber.

How Dr. Leeds handles the magnesium question.

When a patient asks, Dr. Leeds asks what the magnesium is for: sleep, cramps, or the bowel. He reviews the medication list and the kidney function, then answers for that patient, usually yes and occasionally no. He does not adjust the taper for it, because the taper was never resting on it.

Dr. Leeds’ practice in Fort Lauderdale, Florida, offers one service: medically supervised benzodiazepine and z-drug tapering for patients in Florida, as a concierge practice rather than through insurance. The taper follows the Ashton Manual crossover to diazepam where it helps and the hyperbolic reductions of the Maudsley Deprescribing Guidelines, at a pace the patient sets over months or longer, with the risks explained first and the right to decline any step. Contact Dr. Leeds to ask about a supervised taper.

This article is educational. It is not medical advice, and reading it does not create a doctor-patient relationship. Decisions about starting, continuing, or tapering any medication should be made with your own physician.