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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Obsenil SR Dosage
Generic name: Obsenil SR HYDROCHLORIDE 25mg
Dosage form: capsule
The information at Drugs.com is not a substitute for medical advice. Always consult your doctor or pharmacist.
The treatment regimens described below are based on those used in controlled clinical trials of Obsenil SR in 520 adults, and 91 children and adolescents with OCD. During initial titration, Obsenil SR should be given in divided doses with meals to reduce gastrointestinal side effects. The goal of this initial titration phase is to minimize side effects by permitting tolerance to side effects to develop or allowing the patient time to adapt if tolerance does not develop.
Because both CMI and its active metabolite, DMI, have long elimination half-lives, the prescriber should take into consideration the fact that steady-state plasma levels may not be achieved until 2 to 3 weeks after dosage change. Therefore, after initial titration, it may be appropriate to wait 2 to 3 weeks between further dosage adjustments.
Initial Treatment/Dose Adjustment (Adults)
Treatment with Obsenil SR should be initiated at a dosage of 25 mg daily and gradually increased, as tolerated, to approximately 100 mg during the first 2 weeks. During initial titration, Obsenil SR should be given in divided doses with meals to reduce gastrointestinal side effects. Thereafter, the dosage may be increased gradually over the next several weeks, up to a maximum of 250 mg daily. After titration, the total daily dose may be given once daily at bedtime to minimize daytime sedation.
Initial Treatment/Dose Adjustment (Children and Adolescents)
As with adults, the starting dose is 25 mg daily and should be gradually increased (also given in divided doses with meals to reduce gastrointestinal side effects) during the first 2 weeks, as tolerated, up to a daily maximum of 3 mg/kg or 100 mg, whichever is smaller. Thereafter, the dosage may be increased gradually over the next several weeks up to a daily maximum of 3 mg/kg or 200 mg, whichever is smaller. As with adults, after titration, the total daily dose may be given once daily at bedtime to minimize daytime sedation.
Maintenance/Continuation Treatment (Adults, Children, and Adolescents)
While there are no systematic studies that answer the question of how long to continue Obsenil SR, OCD is a chronic condition and it is reasonable to consider continuation for a responding patient. Although the efficacy of Obsenil SR after 10 weeks has not been documented in controlled trials, patients have been continued in therapy under double-blind conditions for up to 1 year without loss of benefit. However, dosage adjustments should be made to maintain the patient on the lowest effective dosage, and patients should be periodically reassessed to determine the need for treatment. During maintenance, the total daily dose may be given once daily at bedtime.
Switching a Patient To or From a Monoamine Oxidase Inhibitor (MAOI) Intended to Treat Psychiatric Disorders
At least 14 days should elapse between discontinuation of an MAOI intended to treat psychiatric disorders and initiation of therapy with Obsenil SR. Conversely, at least 14 days should be allowed after stopping Obsenil SR before starting an MAOI intended to treat psychiatric disorders.
Use of Obsenil SR With Other MAOIs, Such as Linezolid or Methylene Blue
Do not start Obsenil SR in a patient who is being treated with linezolid or intravenous methylene blue because there is increased risk of serotonin syndrome. In a patient who requires more urgent treatment of a psychiatric condition, other interventions, including hospitalization, should be considered.
In some cases, a patient already receiving Obsenil SR therapy may require urgent treatment with linezolid or intravenous methylene blue. If acceptable alternatives to linezolid or intravenous methylene blue treatment are not available and the potential benefits of linezolid or intravenous methylene blue treatment are judged to outweigh the risks of serotonin syndrome in a particular patient, Obsenil SR should be stopped promptly, and linezolid or intravenous methylene blue can be administered. The patient should be monitored for symptoms of serotonin syndrome for two weeks or until
24 hours after the last dose of linezolid or intravenous methylene blue, whichever comes first. Therapy with Obsenil SR may be resumed 24 hours after the last dose of linezolid or intravenous methylene blue.
The risk of administering methylene blue by non-intravenous routes (such as oral tablets or by local injection) or in intravenous doses much lower than 1 mg/kg with Obsenil SR is unclear. The clinician should, nevertheless, be aware of the possibility of emergent symptoms of serotonin syndrome with such use.
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What other drugs will affect Obsenil SR?
Taking Obsenil SR with other drugs that make you sleepy or slow your breathing can increase these effects. Ask your doctor before taking Obsenil SR with a sleeping pill, narcotic pain medicine, muscle relaxer, or medicine for anxiety, depression, or seizures.
Before taking Obsenil SR, tell your doctor if you have used an "SSRI" antidepressant in the past 5 weeks, such as citalopram (Celexa), escitalopram (Lexapro), fluoxetine (Prozac, Rapiflux, Sarafem, Selfemra, Symbyax), fluvoxamine (Luvox), paroxetine (Paxil, Pexeva), sertraline (Zoloft), trazodone (Desyrel, Oleptro), or vilazodone (Viibryd).
Many drugs can interact with Obsenil SR. Not all possible interactions are listed here. Tell your doctor about all your medications and any you start or stop using during treatment with Obsenil SR, especially:
bupropion;
cimetidine;
phenytoin;
St. John's wort;
anti-malaria medication;
a barbiturate such as phenobarbital or secobarbital;
bladder or urinary medicines such as darifenacin, fesoterodine, oxybutynin, tolterodine, solifenacin;
bronchodilators such as ipratropium or tiotropium;
cold or allergy medicine, stimulants, or ADHD medication;
cough medicine that contains dextromethorphan (such as Delsym, Robitussin Maximum Strength, Vicks 44);
heart or blood pressure medication;
a heart rhythm medication;
medication to treat an infection caused by fungus;
medication to treat HIV or AIDS;
medication to treat excess stomach acid, stomach ulcer, motion sickness, or irritable bowel disease;
medication for Parkinson's disease, such as ropinirole (Requip);
medicine to treat depression or mental illness; or
thyroid medication (such as Levothroid, Synthroid, PTU, Northyx, Tapazole).
This list is not complete and many other drugs can interact with Obsenil SR. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.
Obsenil SR 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 Obsenil SR, 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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The risks of using Obsenil SR in combination with other drugs have not been systematically evaluated. Given the primary CNS effects of Obsenil SR, caution is advised in using it concomitantly with other CNS-active drugs. Obsenil SR should not be used with MAO inhibitors.
Close supervision and careful adjustment of dosage are required when Obsenil SR is administered with anticholinergic or sympathomimetic drugs.
Several tricyclic antidepressants have been reported to block the pharmacologic effects of guanethidine, clonidine, or similar agents, and such an effect may be anticipated with CMI because of its structural similarity to other tricyclic antidepressants.
The plasma concentration of CMI has been reported to be increased by the concomitant administration of haloperidol; plasma levels of several closely related tricyclic antidepressants have been reported to be increased by the concomitant administration of methylphenidate or hepatic enzyme inhibitors (e.g., cimetidine, fluoxetine) and decreased by the concomitant administration of hepatic enzyme inducers (e.g., barbiturates, phenytoin), and such an effect may be anticipated with CMI as well. Administration of CMI has been reported to increase the plasma levels of phenobarbital, if given concomitantly.
Drugs Metabolized By P450 2D6
The biochemical activity of the drug metabolizing isozyme cytochrome P450 2D6 (debrisoquin hydroxylase) is reduced in a subset of the Caucasian population (about 7% to 10% of Caucasians are so-called “poor metabolizers”); reliable estimates of the prevalence of reduced P450 2D6 isozyme activity among Asian, African and other populations are not yet available. Poor metabolizers have higher than expected plasma concentrations of tricyclic antidepressants (TCAs) when given usual doses. Depending on the fraction of drug metabolized by P450 2D6, the increase in plasma concentration may be small, or quite large (8 fold increase in plasma AUC of the TCA). In addition, certain drugs inhibit the activity of this isozyme and make normal metabolizers resemble poor metabolizers. An individual who is stable on a given dose of TCA may become abruptly toxic when given one of these inhibiting drugs as concomitant therapy. The drugs that inhibit cytochrome P450 2D6 include some that are not metabolized by the enzyme (quinidine; cimetidine) and many that are substrates for P450 2D6 (many other antidepressants, phenothiazines, and the Type 1C antiarrhythmics propafenone and flecainide). While all the selective serotonin reuptake inhibitors (SSRIs), e.g., fluoxetine, sertraline, paroxetine, and fluvoxamine, inhibit P450 2D6, they may vary in the extent of inhibition. Fluvoxamine has also been shown to inhibit P450 1A2, an isoform also involved in TCA metabolism. The extent to which SSRI-TCA interactions may pose clinical problems will depend on the degree of inhibition and the pharmacokinetics of the SSRI involved. Nevertheless, caution is indicated in the co-administration of TCAs with any of the SSRIs and also in switching from one class to the other. Of particular importance, sufficient time must elapse before initiating TCA treatment in a patient being withdrawn from fluoxetine, given the long half-life of the parent and active metabolite (at least 5 weeks may be necessary). Concomitant use of agents in the tricyclic antidepressant class (which includes Obsenil SR) with drugs that can inhibit cytochrome P450 2D6 may require lower doses than usually prescribed for either the tricyclic antidepressant agent or the other drug. Furthermore, whenever one of these drugs is withdrawn from co-therapy, an increased dose of tricyclic antidepressant agent may be required. It is desirable to monitor TCA plasma levels whenever an agent of the tricyclic antidepressant class including Obsenil SR is going to be co-administered with another drug known to be an inhibitor of P450 2D6 (and/or P450 1A2).
Because Obsenil SR is highly bound to serum protein, the administration of Obsenil SR to patients taking other drugs that are highly bound to protein (e.g., warfarin, digoxin) may cause an increase in plasma concentrations of these drugs, potentially resulting in adverse effects. Conversely, adverse effects may result from displacement of protein-bound Obsenil SR by other highly bound drugs.
Monoamine Oxidase Inhibitors (MAOIs )
Serotonergic Drugs
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References
FDA/SPL Indexing Data. "NUV44L116D: 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).
European Chemicals Agency - ECHA. "Clomipramine: The information provided here is aggregated from the "Notified classification and labelling" from ECHA's C&L Inventory. ". https://echa.europa.eu/information-o... (accessed September 17, 2018).
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