RIFAMATE is a combination capsule containing 300 mg rifampin and 150 mg isoniazid. The capsules also contain the inactive ingredients: colloidal silicon dioxide, FD&C Blue No. 1, FD&C Red No. 40, gelatin, magnesium stearate, sodium starch glycolate, and titanium dioxide.… Continue Reading


RIBASPHERE (ribavirin capsules USP) is a synthetic nucleoside analogue (purine analogue). The chemical name of ribavirin is 1-ß-D-ribofuranosyl-1 -1,2,4-triazole-3-carboxamide and has the following structural formula (see ): Ribavirin is a white, crystalline powder. It is freely soluble in water and… Continue Reading


Ribasphere (ribavirin, USP), is a nucleoside analogue with antiviral activity. The chemical name of ribavirin is 1-β-D-ribofuranosyl-1-1,2,4-triazole-3-carboxamide and has the following structural formula: The molecular formula of ribavirin is CHNO and the molecular weight is 244.2. Ribavirin is a white… Continue Reading


The active ingredient in RAYOS is prednisone (a corticosteroid). Corticosteroids are adrenocortical steroids, both naturally occurring and synthetic. The molecular formula for prednisone is CHO. The chemical name for prednisone is 17,21-dihydroxypregna-1,4-diene-3,11,20-trione, and the structural formula is: Prednisone is a… Continue Reading


ROXYBOND (oxycodone hydrochloride) tablets for oral administration are available in 5 mg, 15 mg, and 30 mg strengths, each containing an equivalent of 4.5 mg, 13.5 mg, and 27 mg of oxycodone free base, respectively. Oxycodone hydrochloride is an opioid… Continue Reading


Reteplase is a non-glycosylated deletion mutein of tissue plasminogen activator (tPA), containing the kringle 2 and the protease domains of human tPA.  Reteplase contains 355 of the 527 amino acids of native tPA (amino acids 1-3 and 176-527).  Reteplase is… Continue Reading

Rasagiline Mesylate

Rasagiline tablets contain rasagiline (as the mesylate), a propargylamine-based drug indicated for the treatment of idiopathic Parkinson’s disease. It is designated chemically as: ()–2-Propynyl-1-indanamine methanesulfonate. The molecular formula of rasagiline mesylate is CHNOS and its molecular weight is 267.34. Its… Continue Reading

Refissa Tretinoin (Emollient)

Refissa [Tretinoin Cream, USP (Emollient) 0.05%], contains the active ingredient tretinoin (a retinoid) in an emollient cream base. Tretinoin is a yellow-to-light-orange crystalline powder having a characteristic floral odor. Tretinoin is soluble in dimethylsulfoxide, slightly soluble in polyethylene glycol 400,… Continue Reading


Reclast contains zoledronic acid, a bisphosphonic acid which is an inhibitor of osteoclastic bone resorption. Zoledronic acid is designated chemically as (1-Hydroxy-2-imidazol-1-yl-phosphonoethyl) phosphonic acid monohydrate and its structural formula is: Zoledronic acid monohydrate is a white crystalline powder. Its molecular… Continue Reading


The active ingredient in ROWASA® (mesalamine) Rectal Suspension Enema, a disposable (60 mL) unit, is mesalamine, also known as 5-aminosalicylic acid (5-ASA). Chemically, mesalamine is 5-amino-2-hydroxybenzoic acid. The empirical formula is CHNO, representing a molecular weight of 153.14. The structural… Continue Reading