What is the recommended dose of N-Acetylcysteine?

- **General use:** 600-1,800mg/day, divided into 2-3 doses - **Up to 3,000mg/day** generally well tolerated - **Routes:** Oral, IV (medical), inhaled (respiratory) - **Take with:** Food to reduce G...

Is N-Acetylcysteine safe to take daily?

N-Acetylcysteine is rated "Prescription Interactions" based on clinical evidence. - **Common:** Nausea, vomiting, dyspepsia, heartburn, diarrhea, headache, joint pain, dizziness - **Inhaled:** Cough, bronchospasm - **IV:** Itching, rash, tachycardia, low BP

Does N-Acetylcysteine interact with any medications?

N-Acetylcysteine has 3 known drug interactions, including interactions with Nitroglycerin, Blood-thinning drugs (warfarin, etc.), BP-lowering drugs. Check with your doctor before combining with prescription medications.

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Ingredient Research

Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD

N-Acetylcysteine

MODERATE EVIDENCESupplementLast updated April 5, 2026

AVELOR SUMMARY

NAC is a precursor to glutathione — your body's master antioxidant. It has anti-inflammatory, antioxidant, and mucus-thinning properties. Our research, from 16 RCTs, 20 meta-analyses, and 39,369 participants, shows broad moderate evidence across respiratory conditions (COPD), psychiatric conditions (bipolar, OCD, addiction), and general antioxidant support. It's also the clinical antidote for acetaminophen overdose. Key safety concern: it impairs blood clotting and causes severe hypotension when combined with nitroglycerin.

EVIDENCE GRADES

COPD symptomsModerate

Psychiatric conditions (bipolar, OCD, addiction)Moderate across multiple conditions

Autism symptomsModerate

Antioxidant capacityModerate

OPTIMAL DOSAGE

General use: 600-1,800mg/day, divided into 2-3 doses
Up to 3,000mg/day generally well tolerated
Routes: Oral, IV (medical), inhaled (respiratory)
Take with: Food to reduce GI effects

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DRUG INTERACTIONS

NitroglycerinSevere

Severe hypotension + headache

Avoid combination.

Blood-thinning drugs (warfarin, etc.)Unknown

Increased bleeding risk

Use caution. Discontinue before surgery.

BP-lowering drugsUnknown

Additive hypotension

Monitor BP.

SAFETY PROFILE

Side Effects

Common: Nausea, vomiting, dyspepsia, heartburn, diarrhea, headache, joint pain, dizziness
Inhaled: Cough, bronchospasm
IV: Itching, rash, tachycardia, low BP

Drug Interactions

Precautions

Pregnancy: Caution. 600mg/day for 4-5 months appears safe. Crosses placental barrier. Longer-term safety not well studied.
Breastfeeding: Caution. No reliable safety data.
Asthma: Higher risk of allergic-like (anaphylactoid) reactions. Avoid unless medically indicated.
Surgery: Discontinue before surgery — impairs clotting, increases surgical blood loss risk.
Bleeding disorders: Use with caution.

WADA Status

Conditionally Prohibited. IV infusion >100mL per 12-hour period without medical indication is prohibited.

WHO SHOULD BE CAREFUL

HOW AVELOR SCORES THIS

Present at 600-1,200mg:✅ Green flag — well-studied, broad evidence base

Combined with nitroglycerin:🔴 Red flag — severe hypotension documented

Pre-surgery without discontinuation guidance:⚠️ Yellow flag — bleeding risk

In someone with asthma:⚠️ Yellow flag — anaphylactoid reaction risk

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Scan Your N-Acetylcysteine Supplement Browse all ingredients

Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated: April 5, 2026

Not medical advice. Based on published clinical research and systematic reviews.

N-Acetylcysteine · interaction landscape

4 flagged

Dangerous

Moderate

Timing

Pre-op

Safety