What's this test for?

This test is ideal if you're taking mexiletine to manage an irregular heartbeat and need to make sure the amount in your blood is at a safe, effective level. It helps if you're experiencing side effects like nausea, tremors, or dizziness, since these can be signs your dose needs adjusting. It's also useful if you want to confirm the medication is staying at a level that actually helps control your heart rhythm.

What happens after I get my results?

Your results will show up in your account with the normal therapeutic range explained, so you can see exactly where your mexiletine level falls. If your level is too low or too high, simple next steps include noting the timing of your last dose and considering a retest, since timing greatly affects the reading. If a result is dangerously high or you're having severe symptoms like fainting or chest pain, seek medical care right away. You can download the full lab report anytime and use the trends feature to track your levels over multiple tests.

Who should consider this test?

Anyone currently prescribed mexiletine for irregular heartbeats should consider this test, especially if their dose was recently changed. It's also a good idea if you've started or stopped other medications, since many drugs interact with mexiletine and change how your body processes it. People experiencing new or worsening side effects should also check their levels.

What symptoms indicate I may need this test?

Symptoms like tremors, unsteady walking, blurred vision, nausea, or a fast or irregular heartbeat can signal that your mexiletine level is off. Feeling unusually tired or confused can also be a sign the level is too high. On the other hand, if your irregular heartbeat symptoms are coming back, your level might be too low.

When will I get my results?

Results are typically ready within about 7 days of your blood draw. You'll get a notification and can log into your account to view the report as soon as it's available. This turnaround gives enough time for the specialized lab analysis this drug level test requires.

What is mexiletine and why does it matter?

Mexiletine is a medication used to control certain types of irregular heartbeats by calming down overactive electrical signals in the heart. Because the difference between a helpful dose and a harmful one is small, keeping the blood level in a safe range really matters. Regular monitoring helps make sure you're getting the benefit without the risk of side effects.

What does high mexiletine mean?

A high level can mean the medication is building up in your body faster than it's being cleared, which raises the risk of side effects like tremors, nausea, confusion, or dangerous heart rhythm changes. This can happen if the dose is too high, if liver function is reduced, or if another medication is slowing down how mexiletine is broken down. If your level comes back high and you're having symptoms like severe dizziness or fainting, seek medical care promptly.

What does low mexiletine mean?

A low level often means the medication isn't reaching enough of a concentration to control your irregular heartbeat effectively. This can happen if a dose was missed, taken late, or if your body is processing the drug faster than expected. If your symptoms of irregular heartbeat return, this is worth addressing soon through a retest and dose review.

How often should I retest?

Retesting frequency depends on your specific situation, but many people on a stable mexiletine dose retest every few months to confirm levels stay steady. If your dose was just changed or you started a new medication, retesting sooner — often within a week or two — helps catch any issues early. Your prescribing information or order confirmation may have more specific guidance for your case.

What should I do if my results are abnormal?

If your level is outside the normal range, start by noting when you took your last dose and any other medications or supplements you've started recently, since these details help explain the result. Consider retesting to confirm the reading, especially if timing wasn't ideal. If you're having concerning symptoms like an irregular heartbeat, severe tremors, or fainting, seek medical care immediately rather than waiting.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

Mexiletine Blood Test - Heart Rhythm Drug Monitoring

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

[email protected]

Mexiletine Drug Level Blood Test

Mexiletine, Serum/Plasma

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

What's this test for?

What happens after I get my results?

Who should consider this test?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Find a lab near you

Mexiletine Drug Level Blood Test

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

1,000,000+ blood tests later, here's what our customers say