QUESTRAN (Cholestyramine for Oral Suspension USP), the chloride salt of a basic anion exchange resin, a cholesterol lowering agent, is intended for oral administration. Cholestyramine resin is quite hydrophilic, but insoluble in water. The cholestyramine resin in QUESTRAN is not… Continue Reading


Quartette (levonorgestrel/ethinyl estradiol and ethinyl estradiol) tablets is an extended-cycle oral contraceptive. Quartette consists of 42 light pink tablets containing 0.15 mg levonorgestrel and 0.02 mg ethinyl estradiol, 21 pink tablets containing 0.15 mg levonorgestrel and 0.025 mg ethinyl estradiol,… Continue Reading


Lisinopril is an oral long-acting angiotensin converting enzyme (ACE) inhibitor. Lisinopril is a synthetic peptide derivative that is manufactured as a dihydrate and is chemically described as 1-[ -[()-1-Carboxy-3-phenylpropyl]-L-lysyl]-L-proline dihydrate. Its molecular formula is CHNO·2HO and its structural formula is:… Continue Reading


Beclomethasone dipropionate USP, the active component of QNASL Nasal Aerosol, is an anti-inflammatory steroid having the chemical name 9-chloro-11β,17,21-trihydroxy-16β-methylpregna-1,4-diene-3,20-dione 17, 21-dipropionate and the following chemical structure: Beclomethasone dipropionate, a di-ester of beclomethasone (a synthetic corticosteroid chemically related to dexamethasone), is… Continue Reading

Quinapril HCL and Hydrochlorothiazide

Quinapril Hydrochloride and Hydrochlorothiazide Tablet, USP is a fixed-combination tablet that combines an angiotensin-converting enzyme (ACE) inhibitor, quinapril hydrochloride, and a thiazide diuretic, hydrochlorothiazide. Quinapril hydrochloride is chemically described as [3S-[2[R*(R*)], 3R*]]-2-[2- [[1-(ethoxycarbonyl)-3-phenylpropyl]amino]-1-oxopropyl]-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid, monohydrochloride. Its empirical formula is CHNO.… Continue Reading


Topiramate, USP, is a sulfamate-substituted monosaccharide. QUDEXY XR (topiramate) extended-release capsules are available as 25 mg, 50 mg, 100 mg, 150 mg, and 200 mg capsules for oral administration as whole capsules or opened and sprinkled onto a spoonful of… Continue Reading


Quetiapine is a psychotropic agent belonging to a chemical class, the dibenzothiazepine derivatives. The chemical designation is 2-[2-(4-dibenzo [ ] [1,4]thiazepin-11-yl-1-piperazinyl)ethoxy]-ethanol fumarate (2:1) (salt). It is present in tablets as the fumarate salt. All doses and tablet strengths are expressed… Continue Reading