Arsenor is indicated for the treatment of adult patients with active psoriatic arthritis and moderate to severe plaque psoriasis who are candidates for phototherapy or systemic therapy.

Apremilast is a novel, orally available small molecule inhibitor of type-4 cyclic nucleotide phosphodiesterase (PDE-4). PDE-4 is a cyclic adenosine monophosphate (cAMP)-specific phosphodiesterase that is predominantly located in inflammatory cells. By inhibiting PDE-4, apremilast increases intracellular levels of cAMP and thereby inhibits the production of multiple proinflammatory mediators including PDE-4, TNF-alpha, interleukin-2 (IL-2), interferon-gamma, leukotrienes, and nitric oxide synthase. By targeting a central component of the inflammatory signaling cascade rather than a single inflammatory marker, PDE-4 inhibition may restore the homeostatic balance between pro- and anti-inflammatory signalling.

The recommended initial dosage titration of Apremilast from Day 1 to Day 5 is shown below. Following the 5-day titration, the recommended maintenance dosage is 30 mg twice daily taken orally starting on Day 6. This titration is intended to reduce the gastrointestinal symptoms associated with initial therapy. Apremilast can be administered without regard to meals.

Day 1: 10 mg in morning
Day 2: 10 mg in morning and 10 mg in evening
Day 3: 10 mg in morning and 20 mg in evening
Day 4: 20 mg in morning and 20 mg in evening
Day 5: 20 mg in morning and 30 mg in evening
Day 6: 30 mg twice daily

Dosage adjustment in patients with severe renal impairment. Apremilast dosage should be reduced to 30 mg once daily in patients with severe renal impairment. For initial dosage titration, it is recommended that Apremilast be titrated using only the morning schedule and the evening doses be skipped.

Co-administration of strong cytochrome P450 enzyme inducer Rifampin resulted in a reduction of systemic exposure of Arsenor.Therefore.the use of cytochrome P450 enzyme inducers (e.g. Rifampin, Phenobarbital,Carbamazepine, Phenytoin) with Arsenor is not recommended.

Apremilast is contraindicated in patients with a known hypersensitivity to Apremilast or to any of the excipients in the formulation.

The most frequently occurring side effects of Arsenor are nausea, diarrhea and headache. Other less frequent side effects are upper respiratory tract infection, vomiting, naospharyngitis, abdominal pain, hypersensitivity, gastroesophageal reflux disease, dyspepsia, fatigue, decrease appetite, cough, rash, insomnia.

Pregnancy Category C. It is not known whether Apremilast or its metabolites are present in human milk; however, Apremilast was detected in milk of lactating mice. Caution should be exercised when Apremilast is administered to a nursing woman.

Treatment with Arsenor is associated with an increase in adverse reactions of depression. Patients, their caregivers and families should be advised of the need to be alert for the emergence or worsening of depression, suicidal thoughts or other mood changes and if such changes occur to contact their healthcare provider. Prescribers should carefully evaluate the risks and benefits of continuing treatment with Arsenor if such events occur.

During the controlled period of the studies in psoriatic arthritis, weight decrease between 5-10% of body weight was reported in 10% of subjects treated with Arsenor 30 mg twice daily compared to 3.3% treated with placebo.

Use in Paediatric patient: The safety and effectiveness of Arsenor in paediatric patients less than 18 years of age have not been established.

Disease-modifying antirheumatic drugs (DMARDs)

Store at cool & dry place, protected from light & moisture. Keep the medicine out of the reach of children.