Overview
Etrafon is a common brand name for a medication that contains both amitriptyline and perphenazine. Amitriptyline is a tricyclic antidepressant (TCA), and perphenazine is a potent antipsychotic. Alone, amitriptyline is used to treat depression; perphenazine alone is used to treat anxiety and agitation.

This combination is available in several variations so that the amount of each medicine can be customized to the patient. Some combinations of amitriptyline and perphenazine include:

Etrafon or Triavil tablets: amitriptyline 10 or 25 mg, perphenazine 2 mg
Etrafon-A tablets or Triavil tablets: amitriptyline 10 mg, perphenazine 4 mg
Etrafon-Forte tablets or Triavil tablets: amitriptyline 25 mg, perphenazine 4 mg
Triavil tablets: amitriptyline 50 mg, perphenazine 4 mg

Often, brand names for this combination drug are listed with only amitriptyline or only perphenazine, but it is important to keep in mind that Etrafon and Triavil contain both drugs. Information on risks, side effects, drug interactions, and so on for each drug separately still applies to the combination.

Why is this drug prescribed?
Etrafon is used to treat:

1. major depression with anxiety and agitation
2. patients with both schizophrenia and symptoms of depression
3. severe pre-menstrual syndrome (PMS)
4. insomnia due to Fibromyalgia
   

Warnings and Precautions
Etrafon is not recommended for children under 12 years old.

In children age 12 to 17, dosage should begin lower than the normal adult dose. In children, some side effects are more likely to occur than in adults, especially muscle spasms of the face, neck, and back, tic-like or twitching movements, inability to move the eyes, twisting of the body, or weakness of the arms and legs. Children are more sensitive to the effects or Etrafon than are adults.

Etrafon should not be discontinued suddenly. Dosage should be tapered gradually, especially following long-term treatment, to minimize withdrawal symptoms.

When a medication containing perphenazine is taken for a long time, patients are advised to take a riboflavin (vitamin B2) supplement.

Etrafon may cause drowsiness — patients should not drive or operate heavy machinery until they know that they can safely engage in such activities.

Etrafon may cause increased sensitivity to sunlight (photosensitivity), and reduce the ability to sweat. Patients should avoid saunas, extreme heat, sun lamps, and should wear sunscreen and avoid sun exposure during the middle of the day.

For Pregnant or Nursing Mothers: Etrafon has not been shown to cause birth defects in animal studies. However, some side effects such as tremors have occurred in some newborn babies whose mothers received other phenothiazines during pregnancy. Etrafon passes into breast milk, and may cause drowsiness and other side effects in infants. Etrafon is not recommended for pregnant or nursing women.

Contraindications
Etrafon should Not be used for people with the following medical conditions:

1. an allergy or hypersensitivity to amitriptyline, perphenazine, or any drug containing amitriptyline or perphenazine
2. central nervous system (CNS) depression or taking large doses of CNS depressants
3. bone marrow suppression
4. liver damage or disease (severe)
5. blood disease
6. subcortical damage
7. coma

Precautions
Etrafon may be used with caution in people with the following conditions:

1. epilepsy
2. liver or kidney disease — dosage may need to be lowered
3. Reye's syndrome — increased risk of liver problems
4. asthma
5. alcoholism — risk of heat stroke is increased
6. glaucoma
7. severe mental illness
8. blood disease
9. bipolar disorder
10. heart disease
11. overactive thyroid — risk of serious effects on the heart is increased
12. Parkinson's disease
13. stomach or intestinal problems
14. difficulty urinating
15. breast cancer
16. enlarged prostate

Adverse Reactions
Etrafon may cause the following reactions:

1. decreased sweating
2. photosensitivity
3. dizziness
4. drowsiness
5. mild tiredness or weakness
6. headache
7. increased appetite for sweets
8. dry mouth
9. nasal congestion
10. unpleasant taste
11. unusual weight gain
12. changes in menstrual period
13. decreased sexual ability
14. heartburn
15. increased sweating
16. swelling or pain in breasts or unusual secretion of milk
17. Tardive dyskinesia

Interactions with Drugs and Other Substances
Drugs or substances that may interact with Etrafon include:

1. Antacids containing aluminum or magnesium (2 hours before or after Etrafon) — can decrease Etrafon's effects
2. Epinephrine (Adrenalin) — can cause very low blood pressure (hypotension) and fast heartbeat when taken with Etrafon
3. Levodopa (Dopar) — Etrafon may prevent this medication from working
4. antithyroid agents (medicine for overactive thyroid), cimetidine (Tagamet), methyldopa (Aldomet), metoclopramide (Reglan), metyrosine (Demser), Pemoline (Cylert), pimozide (Orap), promethazine (Phenergan), rauwolfia alkaloids (alseroxylon), trimeprazine (Temaril) — these medications increase the risk of serious side effects
5. amphetamines, appetite suppressants (diet pills), medicine for asthma, medicine for colds, sinus problems, or allergies (including nose drops and sprays) — these medications increase the risk of serious effects on the heart
6. central nervous system (CNS) depressants — these medications increase CNS depression
7. lithium — dosage may need to be adjusted
8. MAO Inhibitors — when taken with Etrafon may lead to sudden high fever, extremely high blood pressure, and severe convulsions; in rare cases, these medications may be used together under close supervision

Sources

http://health.iafrica.com/doconline/qa/pharmacology/etrafon.htm

http://www.parkinsons-information-exchange-network-online.com/drugdb/007.html

http://www.healthtouch.com/bin/EContent_HT/drugShowLfts.asp?fname=use0330.htm&title=Etrafon&cid=HT

http://www.rxmed.com/monographs/etrafon.html