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Frequently Asked Questions
Common questions about Mefloquin® Tablets USP 250mg for patients, healthcare professionals, and distributors.
General Questions
What is Mefloquin® used for?
Mefloquine is used for two main purposes:
- Treatment: To treat uncomplicated malaria caused by Plasmodium falciparum, P. vivax, P. malariae, and P. ovale
- Prevention: To prevent malaria in travelers to areas where malaria is common
It is particularly useful in areas where other antimalarial drugs may not be effective due to resistance.
How long does it take to work?
For Treatment:
- Starts working within 2-4 hours after taking the dose
- Peak blood levels reached in 6-23 hours
- Most patients see improvement in malaria symptoms within 24-48 hours
For Prevention:
- Start taking 1 week before entering malaria area
- Provides protection throughout the weekly dosing period
- Continue for 4 weeks after leaving the malaria area
Can it be taken during pregnancy?
First Trimester: Contraindicated - should not be used during the first three months of pregnancy due to potential risks to the fetus.
Second and Third Trimesters: Use only if the benefits clearly outweigh the risks and under strict medical supervision.
Breastfeeding: Mefloquine passes into breast milk. Consult your healthcare provider about the risks and benefits.
Alternative: Consider other antimalarial medications that are safer during pregnancy.
Is it safe for children?
Yes, mefloquine can be used in children with appropriate dosing:
- Age: Approved for children 6 months and older
- Dosing: Based on body weight (5mg/kg for prevention, 25mg/kg for treatment)
- Maximum dose: Same as adult maximum dose
- Monitoring: Children should be closely monitored for side effects, especially psychiatric symptoms
Always consult a pediatrician or healthcare provider before giving mefloquine to children.
What are common side effects?
Common Side Effects (occur in >10% of patients):
- Nausea and vomiting
- Diarrhea
- Abdominal pain
- Dizziness
- Headache
- Sleep disturbances
- Unusual dreams or nightmares
- Anxiety or nervousness
Less Common but Serious Side Effects:
- Psychiatric symptoms (depression, anxiety, psychosis)
- Seizures
- Heart rhythm problems
- Liver problems
- Severe allergic reactions
Dosage & Administration
How should I take Mefloquin®?
For Treatment:
- Take the full dose as a single dose
- Take with food and at least 8oz (240ml) of water
- Do not crush or chew the tablets
- If vomiting occurs within 1 hour, contact your healthcare provider
For Prevention:
- Take 1 tablet (250mg) once weekly
- Take on the same day each week
- Take with food to reduce stomach upset
- Start 1 week before travel, continue during travel, and for 4 weeks after return
What if I miss a dose?
For Prevention (Weekly Dose):
- Take the missed dose as soon as you remember
- Do not take double doses
- Resume your weekly schedule as soon as possible
- If more than 7 days have passed, consult your healthcare provider
For Treatment:
Since treatment is usually a single dose, missing a dose is rare. However, if vomiting occurs after taking the dose, contact your healthcare provider immediately.
Can I drink alcohol while taking Mefloquin®?
While there is no specific interaction between mefloquine and alcohol, it's generally recommended to limit alcohol consumption for the following reasons:
- Alcohol can increase the risk of dizziness and drowsiness
- Both alcohol and mefloquine can affect liver function
- Alcohol may worsen some side effects like nausea
- Alcohol can impair judgment, which may be concerning if you experience psychiatric side effects
Consult your healthcare provider about alcohol consumption while taking mefloquine.
Safety & Precautions
Who should not take mefloquine?
Do NOT take mefloquine if you have:
- History of seizures or epilepsy
- Current or recent history of depression, anxiety, or other psychiatric disorders
- Allergy to mefloquine or related medications
- Recent use of halofantrine (within 2 weeks)
- Severe liver disease
- Certain heart rhythm problems
Use with caution if you have:
- Heart problems
- Liver problems
- Kidney problems
- Are elderly (>65 years)
Can I drive while taking mefloquine?
Caution is advised:
- Mefloquine can cause dizziness, vertigo, and balance problems
- These side effects can affect your ability to drive safely
- Do not drive until you know how mefloquine affects you
- Be especially cautious during the first few weeks of treatment
- If you experience dizziness or balance problems, do not drive
Consider alternative transportation if you need to travel during the initial treatment period.
How long do side effects last?
Duration varies by side effect:
- Common side effects: Usually resolve within a few days to weeks
- Dizziness and balance problems: May persist for weeks to months
- Psychiatric side effects: Can persist for months after stopping the medication
- Long half-life: The drug stays in your system for 2-3 weeks, so side effects may continue after stopping
If side effects are severe or persistent, contact your healthcare provider immediately.
Travel & Prevention
When should I start taking mefloquine for travel?
Recommended schedule:
- Start: 1 week before entering the malaria-endemic area
- During: Take once weekly on the same day each week
- After: Continue for 4 weeks after leaving the endemic area
Why start early?
- Allows time to identify any side effects before travel
- Ensures adequate blood levels for protection
- Time to switch to alternative if side effects occur
Do I still need mosquito protection?
YES! Mefloquine is not 100% effective:
- Continue using mosquito repellent (DEET 20-50%)
- Sleep under insecticide-treated bed nets
- Wear long-sleeved clothing and long pants
- Use screens on windows and doors
- Avoid outdoor activities during peak mosquito hours (dusk to dawn)
Mefloquine provides protection but should be used as part of a comprehensive malaria prevention strategy.
Can I take other medications with mefloquine?
Some medications should be avoided:
- Absolutely avoid: Halofantrine (increases risk of serious heart problems)
- Use with caution: Quinine, quinidine, chloroquine (may increase heart rhythm problems)
- May affect levels: Some antiepileptic drugs, rifampin
Generally safe with:
- Most antibiotics
- Pain relievers (acetaminophen, ibuprofen)
- Most vitamins and supplements
Always tell your healthcare provider about all medications you are taking.
Emergency Situations
When should I seek immediate medical help?
Seek IMMEDIATE medical attention for:
- Suicidal thoughts or self-harm
- Severe depression or anxiety
- Psychosis or hallucinations
- Seizures or convulsions
- Chest pain or irregular heartbeat
- Severe allergic reaction (swelling of face, lips, tongue, or difficulty breathing)
- Yellowing of skin or eyes (liver problems)
- Severe dizziness or loss of balance
Call emergency services or go to the nearest emergency room immediately.
What if I take too much mefloquine?
Overdose symptoms may include:
- Severe nausea and vomiting
- Dizziness and headache
- Visual disturbances
- Psychiatric symptoms (anxiety, confusion, hallucinations)
- Heart rhythm problems
- Seizures (in severe cases)
If overdose is suspected:
- Seek immediate medical attention
- Call your local poison control center
- Do not induce vomiting unless instructed by medical personnel
- Bring the medication bottle with you to the emergency room