When to Take Muscle Relaxants? Answer for Every Situation

Effective and safe use of muscle relaxants depends on which drug and your situation — here are the quick answers for common scenarios:

• Daytime pain, need to work → choose less-sedating Eperisone (Myonal) after breakfast
• Severe pain, can't sleep → take Norgesic or Tolperisone before bed — the drowsiness side effect aids sleep
• Post-exercise pain → take immediately after meals, start at lowest dose (50 mg)
• Chronic pain, multi-day treatment → 3 times/day after meals; do not exceed 5-7 days without physician consultation
• Pain with fever → do NOT self-medicate with muscle relaxants — possible infection or other disease, see a doctor

This article covers correct usage in all scenarios — before/after meals, onset and duration, combining with other drugs, missed doses, and cautions for special groups.

📖 Read more: Complete muscle relaxant overview — mechanism, side effects, precautions — Muscle Relaxants — Complete Guide

Before or After Meals? The Safest Way to Take

Clear answer: take immediately after meals for all types (Tolperisone, Eperisone, Orphenadrine, Chlorzoxazone).

Why after meals?

• Reduces stomach irritation — especially for those with sensitive stomachs or acid reflux
• Reduces nausea — Tolperisone may cause nausea on an empty stomach
• Absorption — most absorb well with or without food, but post-meal dosing reduces side effects

If you missed taking with food — can you take on empty stomach?

Yes, but drink plenty of water afterward and watch for nausea. If nausea occurs, take the next dose with bread or milk.

Norgesic — already contains Paracetamol, does it differ?

Norgesic has Paracetamol in the tablet — Paracetamol absorbs well with or without food, but the Orphenadrine in the same tablet should still be taken after meals to reduce stomach irritation.

How Fast Does It Work? How Long Does It Last?

Onset of action and duration (half-life) vary by drug:

Tolperisone (Mydocalm, Biocalm)

• Onset: 30-60 minutes
• Peak effect: 1-2 hours
• Half-life: 1.5-2 hours — take 3 times/day
• All-day residual: minimal due to short half-life

Eperisone (Myonal)

• Onset: 30-60 minutes
• Peak effect: 1.5-2 hours
• Half-life: 1.6-1.8 hours — take 3 times/day

Orphenadrine (Norgesic)

• Onset (Paracetamol): 15-30 minutes — fastest due to Para
• Muscle relaxation (Orphenadrine): 1-2 hours
• Half-life: 14-16 hours — long-acting, may dose 2 times/day
• Drowsiness lasts: 6-8 hours — not suitable before work

How Many Days? When Should You Stop?

Standard duration

• Acute pain: 5-7 days — most cases improve within this window
• Chronic muscle inflammation: 1-2 weeks under physician care
• Neurological conditions (Antispastics): long-term, specialist required

When to stop?

• Symptoms resolved — can stop without tapering (for Antispasmodics) — except Baclofen which must NOT be stopped abruptly
• Completed 5-7 day course without improvement → do NOT continue indefinitely, see a doctor
• Severe side effects — generalized rash, yellow eyes — stop immediately

Why not long-term?

Because (1) it may mask underlying conditions deeper than muscles, like herniated disc or nerve compression; (2) Tolperisone may affect liver with long-term use; (3) Norgesic carries Paracetamol overdose risk.

Combining With Other Drugs — Paracetamol, NSAIDs, Antibiotics, Vitamins

✅ Paracetamol — safe to combine

Standard combination doctors prescribe — Paracetamol relieves pain + muscle relaxant relieves spasm. Except Norgesic, which already contains Paracetamol — do NOT take additional Paracetamol.

✅ NSAIDs (Ibuprofen, Naproxen, Celecoxib) — combinable, watch stomach

Can be combined for muscle inflammation — but NSAIDs irritate the stomach, take after meals and avoid long-term use.

✅ Antibiotics — safe to combine

No drug interaction — can be combined for muscle inflammation from infection, under physician care.

✅ Vitamin B12, Methylcobalamin — safe to combine

Supports nerve recovery — Soneriper M is already Tolperisone + Methylcobalamin in one tablet.

❌ Alcohol — never combine

Additive CNS depression, severe drowsiness, may suppress breathing to the point of death.

❌ Sleeping pills, Benzodiazepines (Diazepam, Lorazepam) — do NOT combine

Additive effects, severe drowsiness.

❌ Opioids (Tramadol, Codeine, Morphine) — do NOT combine

Risk of respiratory depression.

❌ Older antihistamines (Chlorpheniramine, CPM) — do NOT combine (especially with Norgesic)

Norgesic already has anticholinergic effects; combining with older antihistamines amplifies severely.

Can I Take Before Bedtime?

Yes, taking before bed can be a good strategy for those whose pain disrupts sleep:

Why bedtime works

• The drowsiness side effect aids sleep
• Muscles relax during sleep — reduces morning pain
• No worry about driving or working

Which is best for bedtime?

• Norgesic — best for bedtime due to 6-8 hour drowsiness + Paracetamol pain relief
• Mydocalm/Biocalm (Tolperisone) — works, but drowsiness is milder, less sleep-aiding than Norgesic
• Myonal (Eperisone) — least drowsy, so less sleep-aiding — but still relaxes muscles during sleep

Cautions

• Take immediately after dinner, not before bed on an empty stomach
• If waking up at night for the bathroom, watch for falls, especially elderly
• Do NOT combine with sleeping pills or alcohol

Taking During Special Activities — Driving, Exercise, Alcohol

🚗 Driving / operating machinery

Avoid for 4-6 hours after taking any muscle relaxant — especially Norgesic with its prolonged drowsiness. Choose Myonal if you must drive.

🏋️ Exercise

Taking muscle relaxants during heavy exercise is not recommended because (1) it may mask injury signals; (2) dizziness increases fall risk. Take only after exercising, for post-workout muscle relaxation.

🍷 Drinking alcohol

Do NOT drink throughout treatment — additive CNS depression, severe drowsiness, can be life-threatening. Wait 24 hours after the last dose.

🩸 Blood donation

Wait at least 24-48 hours after stopping the drug, as it may remain in the bloodstream and affect the recipient. Always inform Red Cross staff if you have recently taken any medication.

💉 Vaccination

Muscle relaxants do not affect vaccine efficacy — get vaccinated normally. But if you feel drowsy from both, be cautious about driving home.

👶 Breastfeeding

Drug passes into breast milk — do NOT self-medicate, always consult a physician first.

Missed Dose or Overdose — What to Do

Missed one dose — what to do?

• Within 2 hours: take immediately
• Close to next dose: skip the missed dose, take the next as scheduled. Do NOT double up.

Took double dose — is it dangerous?

Depends on the drug — for Tolperisone/Eperisone usually not severely dangerous, may cause drowsiness and nausea. But for Norgesic with Paracetamol — taking 2 tablets together may exceed 900 mg Paracetamol in one dose. Skip the next dose instead.

Severe overdose — symptoms and response

• Symptoms: severe drowsiness, confusion, slow breathing, irregular heartbeat, seizures, loss of consciousness
• Response: call 1669 (medical emergency in Thailand) or 911 abroad, or go to the ER immediately — bring the medication with you
• Norgesic overdose: risk of liver damage from Paracetamol — requires N-acetylcysteine antidote

Quick Dosing Summary — Mydocalm Biocalm Myonal Norgesic

* Dose and frequency per label; doctor may adjust per symptoms

Dosing for Special Groups — Pregnancy, Elderly, Children

Pregnancy — do NOT self-medicate

All brands are Pregnancy Category C — used only when necessary and benefits outweigh risks. Always consult an OB-GYN.

Elderly (60+ years)

• Start at the lowest dose — reduces fall risk from drowsiness
• Choose Myonal (Eperisone) as first choice for lowest sedation
• Avoid Norgesic due to anticholinergic effects causing confusion, dry mouth, constipation
• Check chronic conditions first — liver, kidney, glaucoma, enlarged prostate

Children (under 12)

Most are not recommended — limited safety data, use only when prescribed by physician with weight-based dosing.

Breastfeeding mothers

Drug passes into breast milk — do NOT self-medicate, consult a physician first.

Liver / kidney disease patients

Dose adjustment or alternative selection required — physician must adjust. Do NOT self-medicate.