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mefloquine hydrochloride

Apo-Mefloquine (CA), Lariam

Pharmacologic class: 4-quinolinemethanol derivative, quinine analog

Therapeutic class: Antimalarial

Pregnancy risk category C


Unknown. Thought to increase intravesicular pH in parasite acid vesicles and form complexes with hemin, inhibiting parasite development.


Tablets: 250 mg

Indications and dosages

Acute malarial infection

Adults: 1,250 mg P.O. as a single dose

Children: 20 to 25 mg/kg P.O. in two divided doses given 6 to 8 hours apart

Malaria prophylaxis

Adults and children weighing more than 45 kg (99 lb): 250 mg P.O. once weekly on same day each week, starting 1 week before entering endemic area and continuing for 4 weeks after leaving area

Children weighing 30 to 45 kg (66 to 99 lb): 187.5 mg P.O. q week

Children weighing 20 to 30 kg (44 to 66 lb): 125 mg P.O. q week

Children weighing 10 to 20 kg (22 to 44 lb): 62.5 mg P.O. q week

Children weighing 5 to 10 kg (11 to 22 lb): 31.25 mg P.O. q week


• Hypersensitivity to drug, related agents (quinine, quinidine), or excipients

• Prophylactic use in patients with active depression, recent history of depression, generalized anxiety disorder, psychosis, schizophrenia, other psychiatric disorders, or history of seizures


Use cautiously in:

• cardiac disorders, seizure disorders

• pregnant or breastfeeding patients

• children.


• Don't give on empty stomach. Administer with at least 240 ml of water.

• Know that after completing mefloquine therapy for acute malarial infection, patient should receive primaquine (or other 8-aminoquinolone) to prevent relapse.

Adverse reactions

CNS: dizziness, syncope, headache, psychotic changes, depression, hallucinations, confusion, anxiety, fatigue, vertigo, seizures

EENT: blurred vision, tinnitus

GI: nausea, vomiting, diarrhea, loose stools, abdominal discomfort, anorexia

Hematologic: leukopenia, thrombocytopenia

Musculoskeletal: myalgia

Skin: rash

Other: fever, chills


Drug-drug. Beta-adrenergic blockers, quinidine, quinine: ECG abnormalities, cardiac arrest

Chloroquine, quinine: increased risk of seizures

Valproic acid: decreased valproic acid blood level, loss of seizure control

Drug-diagnostic tests. Hematocrit, platelets, white blood cells: decreased values

Transaminases: transient increases

Patient monitoring

Monitor patient with acute Plasmodium vivax malaria who is at high risk for relapse. Because drug doesn't eliminate exoerythrocytic (hepaticphase) parasites, patient should receive primaquine after mefloquine therapy.

Watch for psychiatric symptoms, such as acute anxiety, depression, restlessness, or confusion. These may precede more serious psychiatric events.

• Evaluate hepatic function during prolonged prophylactic therapy.

In patients receiving related drugs (such as quinine, quinidine, or chloroquine) concurrently, be alert for ECG abnormalities and seizures. Separate administration times by at least 12 hours.

Closely monitor patients with serious or life-threatening Plasmodium falciparum infection. Be aware that they should receive I.V. antimalarial drugs and that mefloquine may be used to complete course of therapy.

Patient teaching

• Tell patient to take with full glass of water and not on empty stomach.

• In prophylactic use, instruct patient to take first dose 1 week before departure and to continue therapy as prescribed upon return. Tell him to take drug on same day each week.

• Advise patient to report fever after returning from malarious area.

• Inform patient that malaria prophylaxis should include protective clothing, insect repellent, and bed netting.

Tell patient to immediately report psychiatric symptoms (such as acute anxiety, depression, restlessness, or confusion) and to stop taking drug.

• Caution patient to avoid driving and other hazardous activities because drug may cause dizziness.

• Instruct patient to have periodic ophthalmic exams, because drug may cause eye damage.

• Tell female patient to inform prescriber if she is pregnant.

• Advise female patient not to breastfeed while taking drug.

• As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs and tests mentioned above.


A trademark for the drug mefloquine hydrochloride.


The prophylactic agent of choice for preventing malaria in those travelling to areas with drug-resistant Plasmodium falciparum.
Adverse effects
GI tract disturbances, dizziness; at high doses, convulsions, hallucinations.


Mefloquine, see there.


A brand name for MEFLOQUINE.
References in periodicals archive ?
Father-of-three Anthony says that 12 former colleagues have tragically taken their lives because of Lariam.
It said it was "deeply disturbing" that some personnel apparently preferred to throw away the Lariam they had been prescribed and run the risk of contracting malaria, rather than take the drug.
Now, two years later, Laura Howell not only believed Lariam caused her husband's suicide, she believed the Army was planning to blame martial problems for her husband's violence and death, just as they had at Fort Bragg.
Dr Byrne said: "In areas where malaria is resistant, such as Africa, Lariam may still be the best choice.
But this is a relatively rare problem, and most people have no difficulty with Lariam.
The drug is no longer available in Irish pharmacies but the Defence Forces continue to prescribe it - despite calls in the Dail for the practice to stop - with 1,078 Lariam pills doled out to troops serving overseas in 2016.
Byline: PAT FLANAGAN Who worked in Africa and took a course of Lariam
For this reason, I sometimes transition my patients to Lariam (mefloquine), which gets into the brain better.
The MCC evaluated Cipla's request and responded in June 2004, asking that the package insert be 'brought into line with the innovator product Lariam (Roche)'
Lariam tablets, Roche Products (Pty) Ltd, Package Insert, 28/20.
A TALENTED Cambridge undergraduate killed herself having suffered ``a complete personality change'' after taking the controversial antimalaria drug Lariam, her father told an inquest yester-day.
He said that there is no scientific evidence of a causal link between Lariam and suicide or suicidal ideation, based on all data currently available.