Medications That May Deplete NIACIN

Niacin is a B vitamin your body uses to produce energy and keep your skin, nerves, and digestive system working properly. Here is what makes 6-mercaptopurine unusual: its chemical shape is close enough to a building block of NAD (a key molecule your cells need to make energy) that it can interfere with how the body manufactures niacin-dependent compounds, rather than simply blocking absorption in the gut. At the doses and durations used for some conditions, this interference can meaningfully reduce niacin activity, and in rare cases involving high, prolonged doses, a deficiency state called pellagra has been reported. If you have been on this medication long-term, it is worth asking your pharmacist or doctor whether your niacin status should be checked.

Niacin is a B vitamin your body uses to produce energy and keep your skin, nerves, and digestion working properly. Azamune is broken down in the body into a compound called 6-mercaptopurine, and that byproduct appears to interfere with the way your cells make an important niacin-related molecule, which can gradually reduce your niacin levels. This is rated as a moderate concern, meaning most people will be fine but some long-term users may need attention, especially if a skin rash or other unusual symptoms develop. It is worth bringing up with your pharmacist or doctor, particularly if you have been on Azamune for a while.

Niacin is a B vitamin your body uses for energy production, skin health, and keeping your nervous system working properly. Azathioprine gets converted in the body to a compound called 6-mercaptopurine, and that byproduct appears to interfere with a key step in how your body makes and uses niacin at the cellular level. Because this is rated as a moderate depletion, it is something worth keeping on your radar, especially with long-term use. A conversation with your pharmacist or doctor about your niacin status is a reasonable step, particularly if you notice any unusual skin changes or fatigue.

Niacin is a B vitamin your body uses for energy production and keeping your skin, nerves, and digestion working properly. Here is the interesting part: your body can actually make some of its own niacin by converting the amino acid tryptophan, but benserazide works by blocking the enzyme that drives that conversion, which means less tryptophan gets turned into niacin over time. Studies in people taking levodopa combinations have found early, below-the-radar signs of lower niacin levels, though full-blown deficiency has not been reported. Because the rating here is moderate, it is worth bringing up with your doctor or pharmacist if you have been on this medication long-term, so they can decide whether monitoring or a supplement makes sense for you.

Niacin is a B vitamin your body uses for energy production and keeping your skin, nerves, and digestion working properly. Carbidopa works by blocking an enzyme called dopa decarboxylase, and that same enzyme also helps convert tryptophan (an amino acid from food) into niacin, so blocking it can quietly reduce how much niacin your body makes. Research has shown some people on levodopa/carbidopa have low niacin levels without obvious symptoms, and this is rated a moderate depletion, meaning it is worth paying attention to. If you have been on this medication long-term, it is a reasonable thing to bring up with your pharmacist or doctor.

Niacin is a B vitamin your body uses for energy production and keeping skin, nerves, and digestion working properly. Here is the interesting wrinkle with carbidopa: your body can make its own niacin by converting the amino acid tryptophan, but carbidopa blocks a key enzyme in that conversion pathway, so less tryptophan gets turned into niacin. Research has found signs of below-normal niacin levels in people on levodopa/carbidopa, though serious deficiency has not been reported. Because this is rated moderate depletion, long-term users may want to ask their doctor or pharmacist whether monitoring or a supplement makes sense for them.

Niacin is a B vitamin your body uses for energy production and keeping skin, nerves, and digestion working properly. Here is the interesting part: your body can actually make some of its own niacin by converting tryptophan, an amino acid from food, but carbidopa blocks the enzyme that drives that conversion. Research has found signs of low niacin levels in people taking levodopa/carbidopa, though serious deficiency has not been widely reported. Because this is rated as moderate depletion, long-term users are worth monitoring, so it is reasonable to bring this up with your pharmacist or doctor at your next visit.

Niacin is a B vitamin your body uses to produce energy from food and keep your skin, nerves, and digestion working properly. Chloramphenicol appears to interfere with how your body activates and uses niacin at the cellular level, which in rare cases has been linked to pellagra, a condition caused by severe niacin deficiency. That said, this seems most relevant for people on prolonged courses of the antibiotic, not short-term use. If you are taking chloramphenicol for an extended period, it is worth bringing up with your pharmacist or doctor to see whether any monitoring or support makes sense for you.

Niacin is a B vitamin your body needs for energy, nerve function, and healthy skin. Here is the indirect chain with cycloserine: this antibiotic can deplete pyridoxine (vitamin B6), and your body actually relies on B6 to convert the amino acid tryptophan into niacin. When B6 runs low, that conversion stalls, and niacin levels can quietly fall as a result. Because this is a real, documented concern, people on long-term cycloserine, especially alongside other TB medications, are worth monitoring, so it is a good idea to bring this up with your pharmacist or doctor.

Niacin is a B vitamin your body uses for energy production, healthy skin, and nerve function, and fluorouracil can interfere with it in an indirect way: your body normally makes some of its own niacin by converting the amino acid tryptophan, and fluorouracil appears to block that conversion. This is rated a moderate concern, meaning it does not affect every patient but is worth watching, particularly for people who already have poor nutritional intake or absorption issues. If you are on long-term fluorouracil therapy, it is worth asking your oncologist or pharmacist whether your niacin levels should be monitored.

Niacin is a B vitamin your body uses for energy production, healthy skin, and nerve function. Fluorouracil can interfere with a key step in niacin chemistry: your body normally makes some niacin on its own by converting the amino acid tryptophan, and this drug can block that conversion, leaving you with less niacin than you might expect. Because this is rated moderate depletion, it is worth paying attention to, particularly for patients who are already eating poorly or have trouble absorbing nutrients. If you are on fluorouracil long-term, ask your oncology team or pharmacist whether your niacin level should be checked or whether a supplement makes sense for you.

Niacin is a B vitamin your body uses for energy production and keeping your skin, nerves, and digestive system healthy. Isoniazid can chip away at niacin levels through two routes: it depletes pyridoxine (vitamin B6), which your body normally uses to convert the amino acid tryptophan into niacin, and it may also interfere with how niacin is activated into its working form in the body. Because this is rated as moderate depletion, long-term users, especially those with low dietary niacin intake, have a real reason to ask their doctor or pharmacist whether monitoring or supplementation makes sense for them.

Niacin is a B vitamin your body uses to turn food into energy and keep your skin, nerves, and digestion working properly. Isoniazid is thought to reduce niacin in two ways: it can deplete pyridoxine (vitamin B6), which your body needs to convert the amino acid tryptophan into niacin, and it may also block niacin from being activated into its working form. This is a moderate concern, meaning some long-term users, especially those with low dietary niacin, have developed a deficiency condition called pellagra. If you are taking isoniazid for an extended period, it is worth asking your pharmacist or doctor whether a niacin or niacinamide supplement makes sense for you.

Niacin is a B vitamin your body uses for energy, healthy skin, and nerve function, and isoniazid can chip away at your levels in a couple of ways. It depletes vitamin B6 (pyridoxine), and your body actually needs B6 to convert the amino acid tryptophan into niacin, so losing B6 sets off a chain reaction. Isoniazid may also interfere with how niacin gets activated inside your cells. This is rated a moderate concern, meaning some long-term users, especially those with low dietary niacin, can develop real symptoms, so it is worth asking your doctor or pharmacist whether a B vitamin supplement makes sense for you.

Niacin is a B vitamin your body uses for energy production, skin health, and nerve function, and it gets some of its supply by converting the amino acid tryptophan. When levodopa is combined with carbidopa, carbidopa blocks an enzyme that is part of that tryptophan-to-niacin conversion pathway, which can gradually reduce niacin levels over time. Studies have found signs of low niacin in some long-term levodopa/carbidopa users, so this is worth taking seriously, though full-blown deficiency has not been reported. If you have been on this medication for a while, it is a reasonable thing to bring up with your pharmacist or doctor at your next visit.

Here is something worth knowing about carbidopa specifically: your body normally converts tryptophan, an amino acid from food, into niacin, the B vitamin that helps your cells produce energy and keeps your skin and nervous system healthy. Carbidopa blocks an enzyme involved in that conversion, so over time it can reduce how much niacin your body makes on its own. Studies have found signs of low niacin in some people on this combination, though serious deficiency has not been reported. Because the evidence is rated moderate, it is worth bringing up with your doctor or pharmacist, especially if you have been on this medication long term.

Niacin is a B vitamin your body uses to convert food into energy and keep your skin, nerves, and digestive system working properly. Mephenytoin is closely related to phenytoin, and there are real case reports of people taking phenytoin-type anticonvulsants developing signs of pellagra, which is the condition that happens when niacin runs seriously low. The exact reason this happens is not yet fully understood, but the pattern is recognized enough that it falls under a moderate depletion rating. If you have been on this medication long-term, it is worth mentioning to your pharmacist or doctor so they can decide whether monitoring or a supplement makes sense for you.

Niacin is a B vitamin your body uses to produce energy at the cellular level and keep your skin, nerves, and digestion working properly. Mercaptopurine is chemically similar to a building block the body needs to make an active form of niacin, so the drug can interfere with that process and gradually reduce niacin levels over time. This is rated a moderate concern, meaning it matters most for people on higher doses or very long-term therapy, and a small number of patients do need to address it. If you have been on mercaptopurine for an extended period, it is worth bringing up with your pharmacist or doctor to see whether any monitoring or support makes sense for you.

Niacin is a B vitamin your body uses for energy production, healthy skin, and nerve function. People taking phenytoin, sometimes alongside other seizure medicines like phenobarbital, have been reported in medical literature to develop signs of niacin deficiency, though exactly why this happens is not yet fully understood. Because this is rated as a moderate concern, longer-term users have a real reason to bring it up with their pharmacist or doctor, who can check whether any monitoring or supplementation makes sense for them personally.

Niacin is a B vitamin your body uses for energy, healthy skin, and nerve function, and there are case reports of people on phenytoin developing pellagra, which is a classic niacin deficiency illness. Exactly how phenytoin interferes is not yet understood, but the pattern has shown up enough times to earn a moderate concern rating. If you have been on phenytoin long-term, it is worth bringing up with your pharmacist or doctor, since some patients do end up needing a supplement.

Niacin is a B vitamin your body uses for energy production and keeping your skin, nerves, and digestion working properly. Real-world case reports have shown that some people taking sodium valproate developed signs of niacin deficiency, though researchers have not yet pinned down exactly why this happens. Because the evidence is rated moderate, this is not something to ignore if you have been on this medication long-term. It is worth bringing up with your pharmacist or doctor, especially if you notice symptoms like skin changes, fatigue, or digestive upset.

Niacin (vitamin B3) helps your body turn food into energy and keeps your skin, nerves, and digestive system working properly. Valproic acid has been reported in case reports to lower niacin levels, though researchers have not yet pinned down exactly why this happens. Because this is rated as a moderate concern, it is worth keeping on your radar, especially if you have been on this medication long-term. Ask your pharmacist or doctor whether monitoring your niacin status makes sense for you.