When should Tegretol level be drawn?

When checking carbamazepine levels in a patient on a regular medication regimen, the specimen should be drawn immediately prior to next carbamazepine dose (trough).

When should carbamazepine levels be checked?

After starting carbamazepine, serum levels should be measured frequently, for example every three, six, and nine weeks. Then, carbamazepine levels should be monitored every two to three months thereafter or after a CYP3A4 inhibitor/inducer is added.

Do you need to monitor carbamazepine levels?

For example, carbamazepine and phenytoin require a complete blood count at initiation and periodic hepatic and renal function monitoring; and valproate requires periodic monitoring of liver function tests, especially in the first six months.

Can Tegretol levels be checked?

A Carbamazepine Blood Test is a test that evaluates the blood levels of carbamazepine. It is used in the dose adjustment and to ensure that carbamazepine levels remain within an acceptable range.

What should carbamazepine levels be?

Results are given in micrograms per milliliter (mcg/mL) or micromoles per liter (micromol/L). Safe blood levels of carbamazepine are 4 to 12 mcg/mL, or 17 to 51 micromol/L. You may have seizures, low blood pressure or fall into a coma if your levels are above 40 mcg/mL, or 170 micromol/L.

How do you measure carbamazepine levels?

Despite the lack of systematic studies it is concluded that measuring plasma levels to determine the therapeutic range of carbamazepine should use trough levels, which should provisionally be aimed at between six and eight mg/l. In order to avoid adverse effects, peak levels should not exceed 12 (or even 10) mg/l.

What happens if your Tegretol level is too high?

It causes dizziness, imbalance, drowsiness, coma, and generalized seizures. It can cause abnormal cardiac conduction that can lead to arrhythmia.

What labs should be monitored with carbamazepine?

Laboratory Studies

  • Alcohol level, if alcohol toxicity is suspected.
  • Serum electrolyte levels, including glucose, calcium, magnesium, phosphate, serum bicarbonate, blood urea nitrogen (BUN), and serum creatinine levels; hyponatremia can be seen with long-term use but rarely is noted in acute overdose.

What labs do you monitor with Tegretol?

ONGOING MONITORING: Baseline labs: urine pregnancy, platelets, reticulocytes, serum iron, CMP. Monitoring of blood levels is recommended with the usual adult therapeutic drug levels between 4 and 12 mcg/mL.

What is an adverse reaction to carbamazepine?

In Summary. Commonly reported side effects of carbamazepine include: ataxia, dizziness, drowsiness, nausea, and vomiting. Other side effects include: pruritus, speech disturbance, amblyopia, and xerostomia. See below for a comprehensive list of adverse effects.

What severe side effect of carbamazepine requires frequent monitoring?

The Centre for Adverse Reactions Monitoring recently received 3 reports of serious adverse reactions with carbamazepine: severe cholestatic jaundice, Stevens-Johnson syndrome, and multiorgan hypersensitivity with fulminant liver failure resulting in death.

What are the contraindications of Tegretol?

Who should not take TEGRETOL?

  • a disorder with excess antidiuretic hormone called syndrome of inappropriate antidiuretic hormone.
  • high cholesterol.
  • low amount of sodium in the blood.
  • hepatic porphyria.
  • decreased function of bone marrow.
  • low blood counts due to bone marrow failure.
  • decreased blood platelets.

What are the common side effects of Tegretol?

Nausea, vomiting, dizziness, drowsiness, constipation, dry mouth, or unsteadiness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

What should you not take with carbamazepine?

You should preferably avoid the regular consumption of grapefruits and grapefruit juice while taking carBAMazepine. This can cause carBAMazepine levels to increase. You should report signs of carBAMazepine side effects such as nausea, visual disturbances, dizziness, or muscle weakness to your doctor.

What medications interact with Tegretol?

Serious Interactions


How many milligrams of Tegretol are in each tablet?


Initial Dose
Indication Tablet* XR†
Over 12 yr 200 mg b.i.d. (400 mg/day) 200 mg b.i.d. (400 mg/day)
Trigeminal Neuralgia 100 mg b.i.d. (200 mg/day) 100 mg b.i.d. (200 mg/day)
*Tablet = Chewable or conventional tablets †XR = Tegretol-XR extended-release tablets

Can you cut Tegretol in half?

The capsule or its contents should not be crushed or chewed. Tegretol® extended-release tablets must be swallowed whole and should not be crushed or chewed. Do not take Tegretol® extended-release tablets that are damaged or have chips or cracks.

How much Tegretol can you take in a day?

It is also valuable for treatment of chronic neuropathic pain. The tablets come in 100 mg and large sizes. The maximum planned dose is 600 mg taken twice a day (morning and near bedtime). The final dose can vary depending on how well it works for you and your tolerance of the medication.