PROTOPIC (tacrolimus) Ointment contains tacrolimus, a macrolide immunosuppressant produced by . It is for topical dermatologic use only. Chemically, tacrolimus is designated as [3-[3*[(1*,3*,4*)],4*,5*,8*,9,12*,14*,15*,16*,18*,19*,26a*]]-5,6,8,11,12,13,14,15,16,17,18,19,24,25,26,26a-hexadecahydro-5,19-dihydroxy-3-[2-(4-hydroxy-3-methoxycyclohexyl)-1-methylethenyl]-14,16-dimethoxy-4,10, 12,18-tetramethyl-8-(2-propenyl)-15,19-epoxy-3H-pyrido[2,1-][1,4] oxaazacyclotricosine-1,7,20,21(4H,23H)-tetrone,monohydrate. It has the following structural formula: Tacrolimus has an empirical formula of CHNO•HO and… Continue Reading

Propoxyphene and Acetaminophen

Propoxyphene Napsylate, USP is an odorless, white crystalline powder with a bitter taste. It is very slightly soluble in water and soluble in methanol, ethanol, chloroform, and acetone. Chemically, it is (α,1)-α-[2-(Dimethylamino)-1-methylethyl]-α-phenylphenethyl propionate compound with 2-napthalenesulfonic acid (1:1) monohydrate, which… Continue Reading

Proventil HFA

The active component of PROVENTIL HFA (albuterol sulfate) Inhalation Aerosol is albuteraol sulfate, USP racemic α [(Butylamino)methyl]-4-hydroxy–xylene-α,α’-diol sulfate (2:1)(salt), a relatively selective beta-adrenergic bronchodilator having the following chemical structure: Albuterol sulfate is the official generic name in the United States.… Continue Reading


Each tablet, for oral administration, contains oxycodone hydrochloride and acetaminophen in the following strengths: Oxycodone Hydrochloride, USP        2.5 mg*Acetaminophen, USP         325 mg*2.5 mg oxycodone HCl is equivalent to 2.2409 mg of oxycodone. Oxycodone Hydrochloride, USP           5 mg*Acetaminophen, USP         325 mg*5 mg oxycodone HCl is… Continue Reading


Perphenazine (4-[3-(2-chlorophenothiazin-10-yl)propyl]-1-piperazineethanol), a piperazinyl phenothiazine, having the chemical formula, CHCINOS. It is available as oral tablets containing 2 mg, 4 mg, 8 mg, and 16 mg of perphenazine. Inactive ingredients: lactose (monohydrate), hydroxypropyl cellulose, hydroxypropyl methylcellulose, magnesium stearate, microcrystalline cellulose,… Continue Reading

Phenytoin Sodium

Phenytoin sodium is an antiepileptic drug. Phenytoin sodium is related to the barbiturates in chemical structure, but has a five-membered ring. The chemical name is sodium 5,5-diphenyl-2,4-imidazolidinedione, having the following structural formula: Each Extended Phenytoin Sodium Capsule, USP contains 100… Continue Reading

Promethazine Hydrochloride and Dextomethorphan Hydrobromide

Each 5 mL (one teaspoonful), for oral administration contains: dextromethorphan hydrobromide 15 mg; promethazine hydrochloride 6.25 mg. Alcohol 7%. Inactive Ingredients:  Ascorbic Acid, Citric Acid, Edetate Disodium, FD&C Yellow #6, Glycerin, Methylparaben, Natural & Artificial Flavors, Purified Water, Saccharin Sodium,… Continue Reading


PAXIL CR (paroxetine hydrochloride) is an orally administered psychotropic drug with a chemical structure unrelated to other selective serotonin reuptake inhibitors or to tricyclic, tetracyclic, or other available antidepressant or antipanic agents. It is the hydrochloride salt of a phenylpiperidine… Continue Reading

Perindopril Erbumine

Perindopril erbumine tablets are the tert-butylamine salt of perindopril, the ethyl ester of a non-sulfhydryl angiotensin-converting enzyme (ACE) inhibitor. Perindopril erbumine is chemically described as (2S,3αS,7αS)-1-[(S)-N-[(S)-1-Carboxy-butyl]alanyl]hexahydro-2-indolinecarboxylic acid, 1-ethyl ester, compound with tert-butylamine (1:1). Its molecular formula is CHNOCHN. Its structural… Continue Reading