NAC 1000 mg Ingredients & Drug Interactions
by NOW
What is this page for?
First and foremost: checking NAC 1000 mg against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
NAC 1000 mg is a dietary supplement by NOW with 1 active ingredient. Its ingredients are commonly taken for thinning mucus in lung conditions, acetaminophen (tylenol) overdose treatment, antioxidant and glutathione support.Based on those ingredients, 294 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are N-Acetyl Cysteine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against NAC 1000 mg by NOW
Ask about any prescription or over-the-counter medication and we check it for interactions with NAC 1000 mg by NOW — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of NAC 1000 mg by NOW
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
NAC 1000 mg is a single-ingredient product — each tablet or pill contains 1,000 mg of N-acetyl cysteine, an amino acid that supports lung health and helps clear mucus from the airways. The rest of the tablet is made up of inactive ingredients like microcrystalline cellulose (a binder), croscarmellose sodium (a disintegrant), and sunflower lecithin, which help hold the tablet together and aid absorption.
Does it work?
Strong evidence
The evidence supports NAC for treating acetaminophen poisoning and for certain lung and airway conditions: it's rated effective for atelectasis (a lung collapse), bronchial diagnostic studies, and tracheostomy care, and possibly effective for bronchitis. These are the conditions where the research backing is strongest.
If you're considering NAC for another purpose, the data we have doesn't establish effectiveness — talk with your pharmacist or doctor about what the evidence shows for your specific situation.
How safe is it?
Well-documented data
At typical doses, NAC is generally well tolerated. The most common side effects when taken by mouth are gastrointestinal — diarrhea, dry mouth, nausea, vomiting, heartburn, and loss of appetite.
These effects are more likely with higher doses (more than 9 grams as a single dose or over 30 grams per day). Some people report joint or leg pain.
The safety data during pregnancy and breastfeeding hasn't been well studied, so talk with your doctor or pharmacist for personalized advice before using it during these times.
Meds to double-check
Major interaction found
Before taking NAC, double-check with your pharmacist if you use nitroglycerin (Major concern — risk of severe low blood pressure and headaches), antihypertensive drugs for blood pressure (Moderate), anticoagulants or antiplatelet drugs like warfarin or aspirin (Moderate), chloroquine for malaria (Moderate), or activated charcoal (Moderate).
The bottom line
Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.
NAC is a solid choice if you're dealing with acetaminophen overdose or certain airway conditions, and it's generally well tolerated at normal doses. If you take nitroglycerin, blood pressure medications, blood thinners, or antimalarial drugs, you need to check with your pharmacist first — these combinations need careful attention.
A quick medication review before you start will keep you safe.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jul 24, 2025.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about NAC 1000 mg, straight from the product label.
| Brand | NOW |
|---|---|
| Barcode (UPC) | 733739001849 |
| Net contents | 60 Tablet(s) |
| Market status | On market |
| Date entered into DSLD | Jul 24, 2025 |
| DSLD ID | 335284 |
| Product type | Non-nutrient/non-botanical |
| Supplement form | Tablet Or Pill |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Vegan, Vegetarian, Adult (18 - 50 Years), Kosher, Gluten Free, Dairy Free |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for NAC 1000 mg by NOW, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| N-Acetyl Cysteine | 1 Gram(s) | -- |
Other ingredients: Microcrystalline Cellulose, Hydroxypropyl Cellulose, Stearic Acid, Croscarmellose Sodium, Hypromellose, Stearic Acid, Sunflower Lecithin, Triethyl Citrate, Sunflower Oil, Silicon Dioxide
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Suggested/Recommended/Usage/Directions
Suggested usage: Take 1 tablet 1 to 3 times daily.
Formula
N-acetyl cysteine (NAC) is a stable form of the non-essential amino acid cysteine. It is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures, and promotes the formation of glutathione.
Triangle K (Kosher)
Formulation
Glutathione is a powerful free radical scavenging compound that also helps to maintain normal, balanced immune system function. In addition, NAC can help to support healthy brain and neuronal tissues.
Natural color variation may occur in this product. Free radical protection Immune system support Supports liver health
Non-GMO
Vegetarian/vegan
Made and quality tested in the USA with globally sourced ingredients.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients.
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Precautions
Caution: For adults only. Keep out of reach of children.
Consult physician if pregnant/nursing, taking medication (especially nitroglycerin), or have a medical condition.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
FDA Statement of Identity
A Dietary Supplement
Seals/Symbols
Triangle K (Kosher)
GMP Quality Assured
General Statements
Amino acids Family owned since 1968.
This bottle is made from 100% PCR (post-consumer recycled) resin.
Storage
Store in a cool, dry place after opening.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
NAC 1000 mg by NOW label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in NAC 1000 mg by NOW
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Tablet(s) Dosage formTablet Or Pill Servings per container60 Amounts shown are per serving.
N-Acetyl Cysteine
Interacts with294 drugs
N-acetyl cysteine (NAC) is a supplement form of the amino acid cysteine and a building block for the antioxidant glutathione. It has well-established...
N-Acetyl Cysteine monograph & interactionsOther (inactive) ingredients: Microcrystalline Cellulose, Hydroxypropyl Cellulose, Stearic Acid, Croscarmellose Sodium, Hypromellose, Stearic Acid, Sunflower Lecithin, Triethyl Citrate, Sunflower Oil, Silicon Dioxide. These complete the product’s ingredient list but are not active constituents.
NAC 1000 mg by NOW Drug Interactions
HelloPharmacist Interaction Report
NAC 1000 mg by NOW contains one active ingredient, N-acetyl cysteine, which does interact with several medication types.
The most serious concern is with nitroglycerin (a heart medication) — NAC can increase the risk of severely low blood pressure (hypotension) and severe headaches, especially when the nitroglycerin is given intravenously or through a skin patch.
Read the full breakdown — every affected drug type, severity by severity
NAC may also raise the risk of low blood pressure if you're taking other blood pressure medications (antihypertensives), and it could increase bleeding risk when combined with blood thinners or antiplatelet drugs (like aspirin or warfarin). Additionally, NAC might reduce how well the antimalarial drug chloroquine works, and it can interfere with activated charcoal (sometimes used in poisoning situations) — each may reduce the other's effectiveness.
Altogether, these interactions span 292 individual medications. If you take any prescription medication, especially for blood pressure, heart conditions, or bleeding prevention, run your exact drugs through the checker on this page before you start NAC.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against NAC 1000 mg?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in NAC 1000 mg interact with 294 drugs. Click any drug to see the details.
1 of the 1 ingredient in NAC 1000 mg interact with drugs. Each result below shows which ingredient is responsible. N-Acetyl Cysteine
ArgatrobanArgatroban
How Argatroban interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Argatroban interactionAspirinAngettes 75, ASA, Asaphen, Aspirin, Caprin, Cartia +8 more
How Aspirin interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin interactionAspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium HydroxideAscriptin Codeine #3
How Aspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium Hydroxide interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Aluminum Hydroxide, Codeine Phosphate, Magnesium Hydroxide interactionAspirin, ButalbitalAxotal
How Aspirin, Butalbital interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Butalbital interactionAspirin, Butalbital, CaffeineFiorinal
How Aspirin, Butalbital, Caffeine interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Butalbital, Caffeine interactionAspirin, Butalbital, Caffeine, Codeine PhosphateFiorinal w/ Codeine
How Aspirin, Butalbital, Caffeine, Codeine Phosphate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Butalbital, Caffeine, Codeine Phosphate interactionAspirin, Butalbital, Caffeine, PhenacetinMarnal
How Aspirin, Butalbital, Caffeine, Phenacetin interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Butalbital, Caffeine, Phenacetin interactionAspirin, CaffeineAnacin
How Aspirin, Caffeine interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine interactionAspirin, Caffeine, Codeine PhosphateAnacin w/ Codeine
How Aspirin, Caffeine, Codeine Phosphate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Codeine Phosphate interactionAspirin, Caffeine, Dihydrocodeine BitartrateSynalgos DC
How Aspirin, Caffeine, Dihydrocodeine Bitartrate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Dihydrocodeine Bitartrate interactionAspirin, Caffeine, Dover's PwdAcedoval, Dovacet
How Aspirin, Caffeine, Dover's Pwd interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Dover's Pwd interactionAspirin, Caffeine, HydrocodoneDamason-P
How Aspirin, Caffeine, Hydrocodone interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Hydrocodone interactionAspirin, Caffeine, Isobutylallylbarbituric Acid, PhenacetinLanorinal
How Aspirin, Caffeine, Isobutylallylbarbituric Acid, Phenacetin interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Isobutylallylbarbituric Acid, Phenacetin interactionAspirin, Caffeine, OrphenadrineInvagesic, Invagesic Forte, Norgesic, Norgesic Forte, Orphengesic, Orphengesic Forte
How Aspirin, Caffeine, Orphenadrine interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Orphenadrine interactionAspirin, Caffeine, Phenacetin, PropoxypheneMargesic Comp. 65
How Aspirin, Caffeine, Phenacetin, Propoxyphene interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Caffeine, Phenacetin, Propoxyphene interactionAspirin, Calcium Carbonate, Magnesium Carbonate, Magnesium OxideBufferin
How Aspirin, Calcium Carbonate, Magnesium Carbonate, Magnesium Oxide interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Calcium Carbonate, Magnesium Carbonate, Magnesium Oxide interactionAspirin, CarisoprodolSoma Compound
How Aspirin, Carisoprodol interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Carisoprodol interactionAspirin, Carisoprodol, Codeine PhosphateSoma Compound w/ Codeine
How Aspirin, Carisoprodol, Codeine Phosphate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Carisoprodol, Codeine Phosphate interactionAspirin, Chlorpheniramine, PhenylpropanolamineAlka-Seltzer Plus Cold
How Aspirin, Chlorpheniramine, Phenylpropanolamine interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Chlorpheniramine, Phenylpropanolamine interactionAspirin, Citric Acid, Sodium BicarbonateAlka-Seltzer Pain Reliever and Antacid
How Aspirin, Citric Acid, Sodium Bicarbonate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Citric Acid, Sodium Bicarbonate interactionAspirin, Codeine PhosphateAspirin w/ Codeine
How Aspirin, Codeine Phosphate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Codeine Phosphate interactionAspirin, Codeine Phosphate, MethocarbamolRobaxisal C
How Aspirin, Codeine Phosphate, Methocarbamol interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Codeine Phosphate, Methocarbamol interactionAspirin, Codeine Phosphate, PhenobarbitalPhenaphen
How Aspirin, Codeine Phosphate, Phenobarbital interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Codeine Phosphate, Phenobarbital interactionAspirin, Diphenhydramine, PhenylpropanolamineAlka Seltzer Plus Night Time Effervescent
How Aspirin, Diphenhydramine, Phenylpropanolamine interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Diphenhydramine, Phenylpropanolamine interactionAspirin, DipyridamoleAggrenox, Asasantin Retard
How Aspirin, Dipyridamole interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Dipyridamole interactionAspirin, Ethoheptazine, MeprobamateEquagesic
How Aspirin, Ethoheptazine, Meprobamate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Ethoheptazine, Meprobamate interactionAspirin, HydrocodoneAlor 5 500, Lortab ASA
How Aspirin, Hydrocodone interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Hydrocodone interactionAspirin, MeprobamateMicrainin
How Aspirin, Meprobamate interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Meprobamate interactionAspirin, MethocarbamolRobaxisal
How Aspirin, Methocarbamol interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Methocarbamol interactionAspirin, OmeprazoleYosprala
How Aspirin, Omeprazole interacts with NAC 1000 mg — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl CysteineAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full N-acetyl Cysteine + Aspirin, Omeprazole interactionEach ingredient & the kinds of drugs it affects
For each ingredient in NAC 1000 mg with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
N-Acetyl Cysteine
Nitroglycerin
N-acetyl cysteine can increase the risk for hypotension and headaches when taken with intravenous or transdermal nitroglycerin.
Clinical research shows that concomitant administration of N-acetyl cysteine and intravenous or transdermal nitroglycerin can cause severe hypotension and intolerable headaches. Furthermore, in vitro research suggests that N-acetyl cysteine increases the anticoagulant activity of nitroglycerin.
Activated Charcoal
N-acetyl cysteine might reduce the effects of activated charcoal, while activated charcoal might reduce the absorption of N-acetyl cysteine.
N-acetyl cysteine appears to reduce the capacity of activated charcoal to adsorb acetaminophen and salicylic acid. Conversely, although clinical research suggests that although activated charcoal can reduce the absorption of N-acetyl cysteine by up to 40%, it does not seem to reduce its clinical effects. Other clinical evidence suggests that activated charcoal does not affect the absorption of N-acetyl cysteine.
Anticoagulant/Antiplatelet Drugs
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Clinical research suggests that intravenous N-acetyl cysteine decreases prothrombin time, prolongs coagulation time, decreases platelet aggregation, and increases blood loss in surgical patients. Furthermore, in vitro research suggests that N-acetyl cysteine increases the anticoagulant activity of nitroglycerin.
Antihypertensive Drugs
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Animal research suggests that N-acetyl cysteine potentiates the hypotensive effects of the angiotensin-converting enzyme inhibitors (ACEIs) captopril and enalaprilat. Theoretically, combining N-acetyl cysteine with other antihypertensive drugs might increase the risk of hypotension.
Chloroquine (Aralen)
Theoretically, N-acetyl cysteine might interfere with the antimalarial effects of chloroquine.
Animal research suggests that N-acetyl cysteine might reduce the antimalarial effects of chloroquine by increasing cellular levels of glutathione.
Brand information
Manufacturer and brand details for NAC 1000 mg, from the product label.
NOW
See all NOW products- Name
- NOW FOODS
- Street Address
- 395 S. Glen Ellyn Rd.
- City
- Bloomingdale
- State
- IL
- ZipCode
- 60108
- Web Address
- nowfoods.com
NAC 1000 mg by NOW: Common Questions
Does NAC 1000 mg by NOW interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What is N-acetyl cysteine and what does it do?
What are the most common side effects?
Is it safe to take NAC during pregnancy or while breastfeeding?
Can I take this with my blood pressure medication?
Will this interact with blood thinners like warfarin or aspirin?
Is NAC generally safe to use?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if NAC 1000 mg is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind NAC 1000 mg’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
NAC 1000 mg's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 86 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
N-acetyl Cysteine (nac) 86 references
- Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
- Jepsen S, Hansen AB. The influence of N-acetylcysteine on the measurement of prothrombin time and activated partial thromboplastin time in healthy subjects. Scand J Clin Lab Invest 1994;54:543-7. PubMed
- van Zandwijk N, Dalesio O, Pastorino U, et al. EUROSCAN, a randomized trial of vitamin A and N-acetylcysteine in patients with head and neck cancer or lung cancer. For the European Organization for Research and Treatment of Cancer Head and Neck and Lung C DOI
- Horowitz RS, Dart RC, Jarvie DR, et al. Placental transfer of N-acetylcysteine following human maternal acetaminophen toxicity. J Toxicol Clin Toxicol 1997;35:447-51.
- Bailey B, McGuigan MA. Management of anaphylactoid reactions to intravenous N-acetylcysteine. Ann Emerg Med 1998;31:710-5. PubMed
- Spiller HA, Krenzelok EP, Grande GA, et al. A prospective evaluation of the effect of activated charcoal before oral N-acetylcysteine in acetaminophen overdose. Ann Emerg Med 1994;23:519-23. PubMed
- Ardissino D, Merlini PA, Savonitto S, et al. Effect of transdermal nitroglycerin or N-acetylcysteine, or both, in the long-term treatment of unstable angina pectoris. J Am Coll Cardiol 1997;29:941-7. PubMed
- Horowitz JD, Henry CA, Syrjanen ML, et al. Nitroglycerine/N-acetylcysteine in the management of unstable angina pectoris. Eur Heart J 1988;9:95-100. PubMed
- Louwerse ES, Weverling GJ, Bossuyt PM, et al. Randomized, double-blind, controlled trial of acetylcysteine in amyotrophic lateral sclerosis. Arch Neurol 1995;52:559-64. PubMed
- Wiklund O, Fager G, Andersson A, et al. N-acetylcysteine treatment lowers plasma homocysteine but not serum lipoprotein(a) levels. Atherosclerosis 1996;119:99-106. PubMed
- De Flora S, Grassi C, Carati L. Attenuation of influenza-like symptomatology and improvement of cell-mediated immunity with long-term N-acetylcysteine treatment. Eur Respir J 1997;10:1535-41. PubMed
- Iversen HK. N-acetylcysteine enhances nitroglycerin-induced headache and cranial arterial responses. Clin Pharmacol Ther 1992;52:125-33. PubMed
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