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Trilafon
Perphenazine
$68.00
8mg · 4 × 20 tablets · 1 month supply
GenericGeneric medicine· By Taro
$68.00 per month
Strength
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Annual cost
$884a year at this pack size
Prescription required
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4mg
8mg
FDA boxed warning
WARNING
Increased Mortality in Elderly Patients with Dementia-Related Psychosis
Elderly patients with dementia-related psychosis treated with antipsychotic drugs
are at an increased risk of death. Analyses of seventeen placebo-controlled trials
(modal duration of 10 weeks), largely in patients taking atypical antipsychotic
drugs, revealed a risk of death in drug-treated patients of between 1.6 to 1.7 times
the risk of death in placebo-treated patients. Over the course of a typical 10-week
controlled trial, the rate of death in drug-treated patients was about 4.5%,
compared to a rate of about 2.6% in the placebo group. Although the causes of
death were varied, most of the deaths appeared to be either cardiovascular (e.g.,
heart failure, sudden death) or infectious (e.g., pneumonia) in nature.
Observational studies suggest that, similar to atypical antipsychotic drugs,
treatment with conventional antipsychotic drugs may increase mortality. The
extent to which the findings of increased mortality in observational studies may be
attributed to the antipsychotic drug as opposed to some characteristic(s) of the
patients is not clear. Perphenazine is not approved for the treatment of patients
About Trilafon
Overview
Trilafon contains perphenazine, a phenothiazine medicine supplied as tablets. It is used to treat schizophrenia and to control severe nausea and vomiting in adults. Perphenazine acts throughout the central nervous system, but exactly how it produces its treatment effects is not known.
What it treats
- Schizophrenia - Severe nausea and vomiting in adults
Safety information
Side effects
Movement-related side effects are more common with perphenazine and related medicines than some other side effects. These include restlessness, muscle stiffness or spasms, tremor-like movements, and problems with coordination. Drowsiness may occur, especially during the first two weeks. Other possible effects include dry mouth or increased saliva, constipation, nausea, vomiting, diarrhea, blurred vision, dizziness, headache, sleep difficulties, and changes in appetite or weight. Changes in menstrual periods, breast enlargement, milk production and sexual function may also occur. Contact a doctor promptly for involuntary movements of the tongue, face, mouth, jaw or limbs. These may be signs of tardive dyskinesia, which can persist and may be irreversible, even after treatment stops. Other movement problems can also continue after stopping treatment. A sudden sore throat or other signs of infection need prompt medical review because serious blood-cell disorders can occur. Yellowing of the skin or eyes may indicate liver damage. Difficulty passing urine, severe constipation, fainting, changes in heart rate, or new or worsening mental or behavioral symptoms also require medical attention. Seek urgent medical help for muscle spasms involving the throat, difficulty swallowing or breathing, swelling of the face or throat, or seizures. Serious reported reactions also include severe allergic reactions, bowel paralysis, cardiac arrest and neuroleptic malignant syndrome. Sudden deaths have been reported with this medicine class, although a link to the medicine could not always be established. The label includes reactions reported with related phenothiazine medicines; not all have been reported specifically with perphenazine.
FDA boxed warning
WARNING
Increased Mortality in Elderly Patients with Dementia-Related Psychosis
Elderly patients with dementia-related psychosis treated with antipsychotic drugs
are at an increased risk of death. Analyses of seventeen placebo-controlled trials
(modal duration of 10 weeks), largely in patients taking atypical antipsychotic
drugs, revealed a risk of death in drug-treated patients of between 1.6 to 1.7 times
the risk of death in placebo-treated patients. Over the course of a typical 10-week
controlled trial, the rate of death in drug-treated patients was about 4.5%,
compared to a rate of about 2.6% in the placebo group. Although the causes of
death were varied, most of the deaths appeared to be either cardiovascular (e.g.,
heart failure, sudden death) or infectious (e.g., pneumonia) in nature.
Observational studies suggest that, similar to atypical antipsychotic drugs,
treatment with conventional antipsychotic drugs may increase mortality. The
extent to which the findings of increased mortality in observational studies may be
attributed to the antipsychotic drug as opposed to some characteristic(s) of the
patients is not clear. Perphenazine is not approved for the treatment of patients
A boxed warning is the strongest warning the US Food and Drug Administration requires on a medicine label. Text is taken from the official label, with internal section references removed.
When to call your doctor
If symptoms are severe or getting worse quickly, seek emergency care rather than waiting.
Before taking this medicine
Do not take Trilafon (perphenazine) if you: • Are in a coma or have a severely reduced level of consciousness. • Are receiving large doses of medicines or substances that depress the central nervous system, such as barbiturates, alcohol, narcotics, pain medicines or antihistamines. • Have an existing blood disorder, reduced bone marrow activity or liver damage. • Are allergic to perphenazine, any of its ingredients or related compounds. • Have suspected or confirmed damage to the brain’s subcortical regions, with or without damage to the hypothalamus. Perphenazine can cause a dangerously high body temperature in these patients, sometimes not until 14–16 hours after it is taken.
Interactions
Some antidepressants, including tricyclic antidepressants and the SSRIs fluoxetine, sertraline and paroxetine, can slow the breakdown of perphenazine. This may increase its level in the blood and the risk of side effects or toxicity. Tell your doctor if you take any of these medicines; close monitoring and a prescriber-directed dose adjustment may be needed. Also tell your doctor about other antipsychotics, beta-blockers and medicines for irregular heart rhythms, as some are processed by the same liver enzyme, CYP2D6. People with naturally lower CYP2D6 activity may have higher perphenazine levels and more side effects.
Using Trilafon
Dosing
Dosing is set by your prescriber. Each health care professional may prescribe medication differently according to a patient's medical history and condition, so follow the directions on your prescription label and speak to your doctor or pharmacist before changing anything.
Storage
Store below 25°C in a dry place, in the original pack, away from direct light and moisture. Do not keep it in a bathroom. Keep all medicines out of the sight and reach of children.
Clinical information on this page is summarised from the US FDA label PERPHENAZINE TABLET, FILM COATED [PAR HEALTH USA, LLC] (DailyMed, retrieved 19 September 2026).
Patient information and references
Official and supporting information to read alongside advice from your prescriber or pharmacist.
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