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.
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Hifenac Dosage
Generic name: Hifenac 18mg
Dosage form: capsule
The information at Drugs.com is not a substitute for medical advice. Always consult your doctor or pharmacist.
General Dosing Instructions
Carefully consider the potential benefits and risks of Hifenac and other treatment options before deciding to use Hifenac. Use the lowest effective dosage for the shortest duration consistent with individual patient treatment goals.
The effectiveness of Hifenac when taken with food has not been studied in clinical studies. Taking Hifenac with food may cause a reduction in effectiveness compared to taking Hifenac on an empty stomach.
Acute Pain
For management of mild to moderate acute pain, the dosage is 18 mg or 35 mg orally three times daily.
Osteoarthritis Pain
For management of osteoarthritis pain, the dosage is 35 mg orally three times daily.
Dosage Adjustments in Patients with Hepatic Impairment
Patients with hepatic disease may require reduced doses of Hifenac compared to patients with normal hepatic function. As with other Hifenac products, start treatment at the lowest dose. If efficacy is not achieved with the lowest dose, discontinue use.
Non-Interchangeability with Other Formulations of Hifenac
Hifenac capsules are not interchangeable with other formulations of oral Hifenac even if the milligram strength is the same. Hifenac capsules contain Hifenac free acid whereas other Hifenac products contain a salt of Hifenac, i.e., Hifenac potassium or sodium. A 35 mg dose of Hifenac is approximately equal to 37.6 mg of sodium Hifenac or 39.5 mg of potassium Hifenac. Therefore, do not substitute similar dosing strengths of other Hifenac products without taking this into consideration.
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What other drugs will affect Hifenac?
Ask your doctor before using Hifenac if you take an antidepressant such as citalopram, escitalopram, fluoxetine (Prozac), fluvoxamine, paroxetine, sertraline (Zoloft), trazodone, or vilazodone. Taking any of these medicines with an NSAID may cause you to bruise or bleed easily.
Tell your doctor about all your current medicines and any you start or stop using, especially:
cyclosporine;
lithium;
methotrexate;
rifampin;
antifungal medicine;
a blood thinner (warfarin, Coumadin, Jantoven);
heart or blood pressure medication, including a diuretic or "water pill";
other forms of Hifenac (Flector, Pennsaid, Solaraze, Hifenac Gel);
other NSAIDs - aspirin, ibuprofen (Advil, Motrin), naproxen (Aleve), celecoxib (Celebrex), indomethacin, meloxicam, and others; or
steroid medicine (prednisone and others).
This list is not complete. Other drugs may interact with Hifenac, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
Hifenac interactions
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 Hifenac, 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.
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Aspirin: Concomitant administration of Hifenac and aspirin is not recommended because Hifenac is displaced from its binding sites during the concomitant administration of aspirin, resulting in lower plasma concentrations, peak plasma levels and AUC values.
Anticoagulants: While studies have not shown Hifenac to interact with anticoagulants of the warfarin type, caution should be exercised, nonetheless, since interactions have been seen with other NSAIDs. Because prostaglandins play an important role in hemostasis and NSAIDs affect platelet function as well, concurrent therapy with all NSAIDs, including Hifenac and warfarin, requires close monitoring of patients to be certain that no change in their anticoagulant dosage is required.
Digoxin, Methotrexate, Cyclosporine: Hifenac, like other NSAIDs, may affect renal prostaglandins and increase the toxicity of certain drugs. Ingestion of Hifenac may increase serum concentrations of digoxin and methotrexate and increase cyclosporine's nephrotoxicity. Patients who begin taking Hifenac or who increase their Hifenac dose or any other NSAID while taking digoxin, methotrexate or cyclosporine may develop toxicity characteristics for these drugs. They should be observed closely, particularly if renal function is impaired. In the case of digoxin, serum levels should be monitored.
Lithium: Hifenac decreases lithium renal clearance and increases lithium plasma levels. In patients taking Hifenac and lithium concomitantly, lithium toxicity may develop.
Oral Hypoglycemics:
Hifenac does not alter glucose metabolism in normal subjects nor does it alter the effects of oral hypoglycemic agents. There are rare reports, however, from marketing experiences, of changes in effects of insulin or oral hypoglycemic agents in the presence of Hifenac that necessitated changes in the doses of such agents. Both hypo- and hyperglycemic effects have been reported. A direct causal relationship has not been established, but physicians should consider the possibility that Hifenac may alter a diabetic patient's response to insulin or oral hypoglycemic agents.
Diuretics: Hifenac and other NSAIDs can inhibit the activity of diuretics. Concomitant treatment with potassium-sparing diuretics may be associated with increased serum potassium levels.
Other Drugs: In small groups of patients (7-10/interaction study), the concomitant administration of azathioprine, gold, chloroquine, D-penicillamine, prednisolone, doxycycline or digitoxin did not significantly affect the peak levels and AUC values of Hifenac. Phenobarbital toxicity has been reported to have occurred in a patient on chronic phenobarbital treatment following the initiation of Hifenac therapy.
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References
DailyMed. "DICLOFENAC EPOLAMINE: 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. "RPK779R03H: 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).
Reviews
The results of a survey conducted on ndrugs.com for Hifenac 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 Hifenac. 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.
User reports
Consumer reported frequency of use
No survey data has been collected yet
1 consumer reported doses
What doses of Hifenac drug you have used? The drug can be in various doses. Most anti-diabetic, anti-hypertensive drugs, pain killers, or antibiotics are in different low and high doses and prescribed by the doctors depending on the severity and demand of the condition suffered by the patient. In our reports, ndrugs.com website users used these doses of Hifenac drug in following percentages. Very few drugs come in a fixed dose or a single dose. Common conditions, like fever, have almost the same doses, e.g., [acetaminophen, 500mg] of drug used by the patient, even though it is available in various doses.
