The dose of a drug and dosage of the drug are two different terminologies. Dose is defined as the quantity or amount of medicine given by the doctor or taken by the patient at a given period. Dosage is the regimen prescribed by the doctor about how many days and how many times per day the drug is to be taken in specified dose by the patient. The dose is expressed in mg for tablets or gm, micro gm sometimes, ml for syrups or drops for kids syrups. The dose is not fixed for a drug for all conditions, and it changes according to the condition or a disease. It also changes on the age of the patient.
Generic name: Flexagin 10mg
Dosage form: tablet, film coated
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The recommended dosage of Flexagin is 20 mg once daily. Treatment may be initiated with or without a loading dose, depending upon the patient's risk of Flexagin-associated hepatotoxicity and Flexagin-associated myelosuppression. The loading dosage provides steady-state concentrations more rapidly.
For patients who are at low risk for Flexagin-associated hepatotoxicity and Flexagin-associated myelosuppression the recommended Flexagin loading dosage is 100 mg once daily for 3 days. Subsequently administer 20 mg once daily.
For patients at high risk for Flexagin-associated hepatotoxicity (e.g., those taking concomitant methotrexate) or Flexagin-associated myelosuppression (e.g., patients taking concomitant immunosuppressants), the recommended Flexagin dosage is 20 mg once daily without a loading dose.
The maximum recommended daily dosage is 20 mg once per day. Consider dosage reduction to 10 mg once daily for patients who are not able to tolerate 20 mg daily (i.e., for patients who experience any adverse events listed in Table 1).
Monitor patients carefully after dosage reduction and after stopping therapy with Flexagin, since the active metabolite of Flexagin, teriflunomide, is slowly eliminated from the plasma. After stopping Flexagin treatment, an accelerated drug elimination procedure is recommended to reduce the plasma concentrations of the active metabolite, teriflunomide. Without use of an accelerated drug elimination procedure, it may take up to 2 years to reach undetectable plasma teriflunomide concentrations after stopping Flexagin.
Evaluation and Testing Prior to Starting Flexagin
Prior to starting Flexagin treatment the following evaluations and tests are recommended:
Evaluate patients for active tuberculosis and screen patients for latent tuberculosis infection
Laboratory tests including serum alanine aminotransferase (ALT); and white blood cell, hemoglobin or hematocrit, and platelet counts
For females of reproductive potential, pregnancy testing
Check blood pressure
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What other drugs will affect Flexagin?
Before taking Flexagin, tell your doctor if you are taking cholestyramine (Questran, Prevalite, LoCHOLEST) or rifampin (Rifadin, Rimactane).
Also tell your doctor if you are using medications that can weaken your immune system, such as:
Flexagin can harm your liver. This effect is increased when you also use other medicines harmful to the liver, such as:
birth control pills or hormone replacement therapy;
other arthritis medications such as auranofin (Ridaura) or aurothioglucose (Solganol);
an ACE inhibitor such as benazepril (Lotensin), enalapril (Vasotec), lisinopril (Prinivil, Zestril), quinapril (Accupril), ramipril (Altace), and others;
an antibiotic such as dapsone or erythromycin (E.E.S., EryPed, Ery-Tab, Erythrocin, Pediazole);
an antifungal medication such as fluconazole (Diflucan), itraconazole (Sporanox), or ketoconazole (Nizoral);
cholesterol medications such as niacin (Advicor, Niaspan, Niacor, Slo-Niacin, and others), atorvastatin (Lipitor, Caduet), simvastatin (Zocor, Simcor, Vytorin), and others;
HIV/AIDS medications such as abacavir/lamivudine/zidovudine (Trizivir), lamivudine (Combivir, Epivir), nevirapine (Viramune), tenofovir (Viread), or zidovudine (Retrovir);
an NSAID (non-steroidal anti-inflammatory drug) such as ibuprofen (Advil, Motrin), naproxen (Aleve, Naprosyn, Naprelan, Treximet), celecoxib (Celebrex), diclofenac (Arthrotec, Cambia, Cataflam, Voltaren, Flector Patch, Pennsaid, Solareze), indomethacin (Indocin), meloxicam (Mobic), and others; or
seizure medications such as carbamazepine (Carbatrol, Tegretol), phenytoin (Dilantin), felbamate (Felbatol), valproic acid (Depakene).
This list is not complete and other drugs may interact with Flexagin. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.
Interactions are the effects that happen when the drug is taken along with the food or when taken with other medications. Suppose if you are taking a drug Flexagin, it may have interactions with specific foods and specific medications. It will not interact with all foods and medications. The interactions vary from drug to drug. You need to be aware of interactions of the medicine you take. Most medications may interact with alcohol, tobacco, so be cautious.
Following oral administration, Flexagin is metabolized to an active metabolite, teriflunomide, which is responsible for essentially all of Flexagin's in vivo activity. Drug interaction studies have been conducted with both Flexagin (Flexagin) and with its active metabolite, teriflunomide, where the metabolite was directly administered to the test subjects.
Effect of Potent CYP and Transporter Inducers
Flexagin is metabolized by CYP450 metabolizing enzymes. Concomitant use of Flexagin and rifampin, a potent inducer of CYP and transporters, increased the plasma concentration of teriflunomide by 40%. However, when co-administered with the metabolite, teriflunomide, rifampin did not affect its pharmacokinetics. No dosage adjustment is recommended for Flexagin when coadministered with rifampin. Because of the potential for Flexagin concentrations to continue to increase with multiple dosing, caution should be used if patients are to be receiving both Flexagin and rifampin.
Effect on CYP2C8 Substrates
Teriflunomide is an inhibitor of CYP2C8 in vivo. In patients taking Flexagin, exposure of drugs metabolized by CYP2C8 (e.g., paclitaxel, pioglitazone, repaglinide, rosiglitazone) may be increased. Monitor these patients and adjust the dose of the concomitant drug(s) metabolized by CYP2C8 as required.
Effect on Warfarin
Coadministration of Flexagin with warfarin requires close monitoring of the international normalized ratio (INR) because teriflunomide, the active metabolite of Flexagin, may decrease peak INR by approximately 25%.
Effect on oral Contraceptives
Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. Consideration should be given to the type or dose of contraceptives used in combination with Flexagin.
Effect on CYP1A2 Substrates
Teriflunomide, the active metabolite of Flexagin, may be a weak inducer of CYP1A2 in vivo. In patients taking Flexagin, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. Monitor these patients and adjust the dose of the concomitant drug(s) metabolized by CYP1A2 as required.
Effect on Organic Anion Transporter 3 (OAT3) Substrates
Teriflunomide inhibits the activity of OAT3 in vivo. In patients taking Flexagin, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. Monitor these patients and adjust the dose of the concomitant drug(s) which are OAT3 substrates as required.
Effect on BCRP and Organic Anion Transporting Polypeptide B1 and B3 (OATP1B1/1B3) Substrates
Teriflunomide inhibits the activity of BCRP and OATP1B1/1B3 in vivo. For a patient taking Flexagin, the dose of rosuvastatin should not exceed 10 mg once daily. For other substrates of BCRP (e.g., mitoxantrone) and drugs in the OATP family (e.g., methotrexate, rifampin), especially HMG-Co reductase inhibitors (e.g., atorvastatin, nateglinide, pravastatin, repaglinide, and simvastatin), consider reducing the dose of these drugs and monitor patients closely for signs and symptoms of increased exposures to the drugs while patients are taking Flexagin.
DailyMed. "LEFLUNOMIDE: DailyMed provides trustworthy information about marketed drugs in the United States. DailyMed is the official provider of FDA label information (package inserts).". https://dailymed.nlm.nih.gov/dailyme... (accessed September 17, 2018).
FDA/SPL Indexing Data. "G162GK9U4W: The UNique Ingredient Identifier (UNII) is an alphanumeric substance identifier from the joint FDA/USP Substance Registration System (SRS).". https://www.fda.gov/ForIndustry/Data... (accessed September 17, 2018).
The results of a survey conducted on ndrugs.com for Flexagin are given in detail below. The results of the survey conducted are based on the impressions and views of the website users and consumers taking Flexagin. We implore you to kindly base your medical condition or therapeutic choices on the result or test conducted by a physician or licensed medical practitioners.
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