Lab Test


Doxepin is a medication used to treat depression and anxiety. It can also be used in lower doses to help alleviate chronic pain and to treat insomnia. It belongs to a class of medications called tricyclic antidepressants. The Doxepin test measures both the levels of doxepin and its active metabolite, nordoxepin, in the blood. This test is important to ensure that doxepin levels are within the therapeutic range - high enough to be effective, but not so high as to be toxic.

  • Test Name Doxepin (includes metabolite nordoxepin)
  • Sample Type Blood
  • Preparations Required The patient should avoid consuming alcohol and should inform the doctor about any medications being taken. Your doctor may advise you to temporarily stop taking certain medications before the test.
  • Report Time -

Having the correct levels of doxepin is crucial because inappropriate levels can either lead to ineffective treatment or cause side effects and toxicity. The monitoring of blood levels is especially important when doxepin is prescribed in conjunction with other medications, as interactions can occur.

Home Sample Collection Process
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Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
Reporting of the sample at lab
Reporting of the sample at lab
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Download Reports
Frequently Asked Questions

Measuring levels of Doxepin and nordoxepin helps doctors to determine whether the medication is at the therapeutic levels for effective treatment and to ensure that the levels are not too high which can cause toxicity.

Doxepin is primarily used to treat depression and anxiety. It is also used at lower doses for the treatment of insomnia and chronic pain.

The therapeutic range for doxepin, including its metabolite nordoxepin, generally falls between 50 to 250 ng/mL. However, optimal levels can vary between individuals.

Common side effects of Doxepin include drowsiness, dizziness, dry mouth, constipation, and weight gain. High levels can lead to confusion, irregular heartbeat, seizures, and severe drowsiness.

Doxepin should be taken during pregnancy or breastfeeding only if prescribed by a doctor who believes the benefits outweigh the risks. It is important to discuss this with your healthcare provider.

You should follow your doctor’s instructions regarding preparation, which may include avoiding certain medications and alcohol before the test.

Yes, Doxepin can interact with several other medications including other antidepressants, antihistamines, and medications for irregular heartbeat. It’s essential to inform your doctor of all the medications you are taking.

If your levels are abnormal, your doctor may adjust your dosage or discuss alternative treatments with you. It's important to follow your doctor’s guidance.

Alcohol can interact with Doxepin and should be avoided. Grapefruit juice may also affect levels and should be consumed with caution while taking Doxepin.

Yes, suddenly stopping Doxepin can cause withdrawal symptoms such as nausea, headache, and a general feeling of discomfort. It’s important to follow your doctor’s instructions for tapering off the medication if needed.

Yes, Doxepin can cause drowsiness and impair your ability to focus. It is advisable to avoid driving or operating machinery until you know how Doxepin affects you.

It typically takes 2 to 7 days for your doctor to receive the results.

The frequency of testing depends on various factors including your response to medication and if you are taking other medications. Your doctor will guide you.

Factors such as liver function, kidney function, age, and interactions with other medications can affect levels of Doxepin and nordoxepin in the blood.

In case of abnormal levels, consult the doctor who prescribed the medication, usually a psychiatrist or primary care physician.

The Doxepin and its metabolite nordoxepin are within the therapeutic range is essential for the effective management of depression, anxiety, insomnia, or chronic pain. Regular monitoring and communication with your healthcare provider can optimize treatment outcomes and minimize the risk of side effects or drug interactions. Always follow your doctor’s instructions regarding medication and testing protocols.

Doxepin (includes metabolite nordoxepin)
₹ 6900
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