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The active ingredient in gabapentin capsules is gabapentin, which has the chemical name 1-(aminomethyl) cyclohexaneacetic acid. The molecular formula of gabapentin is C 9 H 17 NO 2 and the molecular weight is 171.24. The structural formula of gabapentin is: Gabapentin is a white to off-white crystalline solid with a pKa1 of 3.7 and a pKa2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is –1.25. Each gabapentin capsule contains 100 mg, 300 mg, or 400 mg of gabapentin and the following inactive ingredients: anhydrous lactose, cornstarch, and talc. The 100 mg capsule shell contains gelatin, sodium lauryl sulfate, and titanium dioxide. The 300 mg capsule shell contains gelatin, sodium lauryl sulfate, titanium dioxide, and yellow iron oxide. The 400 mg capsule shell contains gelatin, sodium lauryl sulfate, red iron oxide, titanium dioxide, and yellow iron oxide. The imprinting ink contains shellac, dehydrated alcohol, isopropyl alcohol, butyl alcohol, propyl glycol, strong ammonia solution, and titanium dioxide. Structure

The active ingredient in gabapentin capsule, USP is gabapentin, USP, which has the chemical name 1-(aminomethyl)cyclohexaneacetic acid. The molecular formula of gabapentin is C 9 H 17 NO 2 and the molecular weight is 171.24. The structural formula of gabapentin is: Gabapentin, USP is a white to off-white crystalline solid with a pK a1 of 3.7 and a pK a2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is –1.25. Each gabapentin capsule, USP contains 100 mg, 300 mg, or 400 mg of gabapentin, USP and the following inactive ingredients: magnesium stearate, pregelatinized starch (corn), starch (corn) and talc. The 100 mg capsule shell contains gelatin, sodium lauryl sulfate and titanium dioxide. The 300 mg capsule shell contains gelatin, sodium lauryl sulfate, titanium dioxide, and iron oxide yellow. The 400 mg capsule shell contains gelatin, sodium lauryl sulfate, titanium dioxide, FD&C Yellow No.6 and FD&C Blue No.1. chem structure

The active ingredient in gabapentin tablets is gabapentin, USP which has the chemical name 1-(aminomethyl)cyclohexaneacetic acid. The molecular formula of gabapentin is C 9 H 17 NO 2 and the molecular weight is 171.24. The structural formula of gabapentin is: Gabapentin, USP is a white to off-white crystalline solid with a pK a1 of 3.7 and a pK a2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is –1.25. Each gabapentin tablet contains 600 mg or 800 mg of gabapentin, USP and the following inactive ingredients: mannitol, hydroxypropyl cellulose, crospovidone, talc, silicon dioxide, glyceryl dibehenate, and magnesium stearate. struc

Tramadol hydrochloride tablets, USP, for oral use, are an opioid agonist. The chemical name for tramadolhydrochloride is (±)cis-2-[(dimethylamino)methyl]-1-(3-methoxyphenyl) cyclohexanol hydrochloride. The structural formula is: The molecular weight of tramadol hydrochloride is 299.8. Tramadol hydrochloride, USP is a white, bitter, crystalline and odorless powder. It is readily soluble in water and ethanol and has a pKa of 9.41. The n-octanol/water log partition coefficient (logP) is 1.35 at pH 7. Tramadol hydrochloride tablets, USP contain 50 mg of tramadol hydrochloride, USP, and are white in color. Inactive ingredients in the tablet are pregelatinized starch, lactose anhydrous, magnesium stearate, microcrystalline cellulose, polyethylene glycol, sodium starch glycolate, titanium dioxide, hypromellose and polysorbate 80. Structure

Tramadol hydrochloride tablets USP, for oral use, are an opioid agonist. The chemical name for tramadol hydrochloride is (±) cis -2-[(dimethylamino)methyl]-1-(3-methoxyphenyl) cyclohexanol hydrochloride. The structural formula is: The molecular weight of tramadol hydrochloride is 299.84. Tramadol hydrochloride, USP is a white or almost white crystalline powder. It is freely soluble in water and in methanol, very slightly soluble in acetone and has a pKa of 9.41. The n-octanol/water log partition coefficient (logP) is 1.35 at pH 7. Tramadol hydrochloride tablets, USP contain 50 mg of tramadol hydrochloride, USP and are white in color. Inactive ingredients in the tablet are hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polysorbate 80, pregelatinized starch, sodium starch glycolate, and titanium dioxide. 1

Buprenorphine Sublingual Tablets are supplied as white to off white, round flat-faced beveled edged tablets debossed with "RP" on one side and an alphanumeric word identifying product and strength on the other side. They contain buprenorphine HCl, a partial agonist at the mu-opioid receptor, and are available in two dosage strengths, 2 mg buprenorphine and 8 mg buprenorphine (as the free base, equivalent to 2.16 mg buprenorphine hydrochloride USP and 8.64 mg buprenorphine hydrochloride USP, respectively). Each tablet also contains lactose monohydrate, povidone K29/32, anhydrous citric acid, trisodium citrate dihydrate, corn starch, mannitol, crospovidone, and magnesium stearate. Chemically, buprenorphine HCl is (2S)-2-[17-Cyclopropylmethyl-4,5α-epoxy-3-hydroxy-6-methoxy- 6α,14-ethano-14α-morphinan-7α-yl]-3,3-dimethylbutan-2-ol hydrochloride. It has the following chemical structure: Buprenorphine HCl has the molecular formula C 29 H 41 NO 4 ∙ HCl and the molecular weight is 504.10. It is a white or off-white crystalline powder, sparingly soluble in water, freely soluble in methanol, soluble in alcohol, and practically insoluble in cyclohexane. Chemical Structure

Buprenorphine sublingual tablet is uncoated, round, biconvex, white to off-white tablet. It contains buprenorphine hydrochloride USP, a partial agonist at the mu-opioid receptor, and is available in two dosage strengths, 2 mg buprenorphine and 8 mg buprenorphine (as the free base, equivalent to 2.16 mg buprenorphine hydrochloride USP and 8.64 mg buprenorphine hydrochloride USP). Each tablet also contains lactose monohydrate, mannitol, povidone, anhydrous citric acid, sodium citrate, butylated hydroxyanisole, corn starch, pregelatinized starch, and magnesium stearate. Chemically, buprenorphine hydrochloride is (2S)-2-[17-Cyclopropylmethyl-4,5α-epoxy-3-hydroxy-6-methoxy-6α,14-ethano-14α-morphinan-7α-yl]-3,3-dimethylbutan-2-ol hydrochloride. It has the following chemical structure: Buprenorphine hydrochloride, USP has the molecular formula C 29 H 41 NO 4 • HCl and the molecular weight is 504.10. It is an off-white crystalline powder, slightly soluble in water, freely soluble in methanol, soluble in alcohol and practically insoluble in cyclohexane. buprenorphine-str

Buprenorphine sublingual tablet is uncoated, round, biconvex, white to off-white tablet. It contains buprenorphine hydrochloride USP, a partial agonist at the mu-opioid receptor, and is available in two dosage strengths, 2 mg buprenorphine and 8 mg buprenorphine (as the free base, equivalent to 2.16 mg buprenorphine hydrochloride USP and 8.64 mg buprenorphine hydrochloride USP). Each tablet also contains lactose monohydrate, mannitol, povidone, anhydrous citric acid, sodium citrate, butylated hydroxyanisole, corn starch, pregelatinized starch, and magnesium stearate. Chemically, buprenorphine hydrochloride is (2S)-2-[17-Cyclopropylmethyl-4,5α-epoxy-3-hydroxy-6-methoxy-6α,14-ethano-14α-morphinan-7α-yl]-3,3-dimethylbutan-2-ol hydrochloride. It has the following chemical structure: Buprenorphine hydrochloride, USP has the molecular formula C 29 H 41 NO 4 • HCl and the molecular weight is 504.10. It is an off-white crystalline powder, slightly soluble in water, freely soluble in methanol, soluble in alcohol and practically insoluble in cyclohexane. buprenorphine-str

Buprenorphine Sublingual Tablets are supplied as white to off white, round flat-faced beveled edged tablets debossed with "RP" on one side and an alphanumeric word identifying product and strength on the other side. They contain buprenorphine HCl, a partial agonist at the mu-opioid receptor, and are available in two dosage strengths, 2 mg buprenorphine and 8 mg buprenorphine (as the free base, equivalent to 2.16 mg buprenorphine hydrochloride USP and 8.64 mg buprenorphine hydrochloride USP, respectively). Each tablet also contains lactose monohydrate, povidone K29/32, anhydrous citric acid, trisodium citrate dihydrate, corn starch, mannitol, crospovidone, and magnesium stearate. Chemically, buprenorphine HCl is (2S)-2-[17-Cyclopropylmethyl-4,5α-epoxy-3-hydroxy-6-methoxy- 6α,14-ethano-14α-morphinan-7α-yl]-3,3-dimethylbutan-2-ol hydrochloride. It has the following chemical structure: Buprenorphine HCl has the molecular formula C 29 H 41 NO 4 ∙ HCl and the molecular weight is 504.10. It is a white or off-white crystalline powder, sparingly soluble in water, freely soluble in methanol, soluble in alcohol, and practically insoluble in cyclohexane. Chemical Structure

Acetaminophen and codeine phosphate tablets are supplied in tablet form for oral administration. Acetaminophen, 4′-hydroxyacetanilide, a slightly bitter, white, odorless, crystalline powder, is a non-opiate, non-salicylate analgesic and antipyretic. It has the following structural formula: Codeine phosphate, 7,8-didehydro-4,5α-epoxy-3-methoxy-17-methylmorphinan-6α-ol phosphate (1:1) (salt) hemihydrate, a white crystalline powder, is a narcotic analgesic and antitussive. It has the following structural formula: Each Acetaminophen and Codeine Phosphate Tablet USP (300 mg/15 mg) contains: Acetaminophen USP………………..…300 mg Codeine Phosphate USP……………….15 mg Each Acetaminophen and Codeine Phosphate Tablet USP (300 mg/30 mg) contains: Acetaminophen USP……………..……300 mg Codeine Phosphate USP……………….30 mg Each Acetaminophen and Codeine Phosphate Tablet USP (300 mg/60 mg) contains: Acetaminophen USP……………..……300 mg Codeine Phosphate USP……………….60 mg In addition, each tablet contains the following inactive ingredients: crospovidone, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized starch, stearic acid. Acetaminophen Chemical Structure Codeine Phosphate Chemical Structure

Acetaminophen and codeine phosphate tablets are supplied in tablet form for oral administration. Acetaminophen, 4′-hydroxyacetanilide, a slightly bitter, white, odorless, crystalline powder, is a non-opiate, non-salicylate analgesic and antipyretic. It has the following structural formula: Codeine phosphate, 7,8-didehydro-4,5α-epoxy-3-methoxy-17-methylmorphinan-6α-ol phosphate (1:1) (salt) hemihydrate, a white crystalline powder, is a narcotic analgesic and antitussive. It has the following structural formula: Each Acetaminophen and Codeine Phosphate Tablet USP (300 mg/15 mg) contains: Acetaminophen USP………………..…300 mg Codeine Phosphate USP……………….15 mg Each Acetaminophen and Codeine Phosphate Tablet USP (300 mg/30 mg) contains: Acetaminophen USP……………..……300 mg Codeine Phosphate USP……………….30 mg Each Acetaminophen and Codeine Phosphate Tablet USP (300 mg/60 mg) contains: Acetaminophen USP……………..……300 mg Codeine Phosphate USP……………….60 mg In addition, each tablet contains the following inactive ingredients: crospovidone, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized starch, stearic acid. Acetaminophen Chemical Structure Codeine Phosphate Chemical Structure

Buprenorphine Sublingual Tablets are supplied as white, sublingual tablets available in two dosage strengths, 2 mg buprenorphine free base and 8 mg buprenorphine free base. Each tablet also contains citric acid anhydrous, corn starch, crospovidone, lactose monohydrate, magnesium stearate, mannitol, povidone, purified water and sodium citrate. Chemically, buprenorphine hydrochloride USP is (6R, 7R, 14S)-17-Cyclopropylmethyl-7,8-dihydro-7-[(1S)-1-hydroxy-1,2,2-trimethylpropyl]-6-O-methyl-6,14-ethano-17-normorphine hydrochloride. It has the following chemical structure: Buprenorphine hydrochloride USP has the molecular formula C 29 H 41 NO 4 • HCl and the molecular weight is 504.12. It is a white or almost white crystalline powder, sparingly soluble in water, freely soluble in methanol, soluble in alcohol and practically insoluble in cyclohexane. buprenorphine-hcl-chem-figure.jpg

Buprenorphine and naloxone sublingual tablets USP are orange, mottled, hexagonal tablets, debossed with an alphanumeric word identifying the product and strength. They contain buprenorphine HCl, a partial agonist at the mu-opioid receptor, and naloxone HCl dihydrate, an opioid receptor antagonist, at a ratio of 4:1 (ratio of free bases). It is intended for sublingual administration and is available in two dosage strengths, 2 mg buprenorphine with 0.5 mg naloxone and 8 mg buprenorphine with 2 mg naloxone. Each sublingual tablet also contains acesulfame potassium, anhydrous citric acid, artificial lemon flavor, FD&C Yellow No. 6 Aluminum Lake, lactose anhydrous, lactose monohydrate, magnesium stearate, mannitol, povidone, sodium citrate and starch (corn starch). Chemically, buprenorphine HCl, USP is (2S)-2-[17-Cyclopropylmethyl-4,5α-epoxy-3-hydroxy-6-methoxy-6α,14-ethano-14α-morphinan-7α-yl]-3,3-dimethylbutan-2-ol hydrochloride. It has the following chemical structure: Buprenorphine HCl, USP has the molecular formula C 29 H 41 NO 4 • HCl and the molecular weight is 504.10. It is a white or off-white crystalline powder, sparingly soluble in water, freely soluble in methanol, soluble in alcohol, and practically insoluble in cyclohexane. Chemically, naloxone HCl dihydrate, USP is 17-Allyl-4,5α-epoxy-3,14-dihydroxymorphinan-6-one hydrochloride dihydrate. It has the following chemical structure: Naloxone hydrochloride dihydrate, USP has the molecular formula C 19 H 21 NO 4 • HCl • 2H 2 O and the molecular weight is 399.87. It is a white to slightly off-white powder and is freely soluble in water, soluble in alcohol, and practically insoluble in toluene and ether. Buprenorphine Chemical Structure Naloxone Chemical Structure

Chlordiazepoxide hydrochloride is the prototype for the benzodiazepine compounds. It is a versatile therapeutic agent of proven value for the relief of anxiety. Chlordiazepoxide hydrochloride is among the safer of the effective psychopharmacologic compounds available, as demonstrated by extensive clinical evidence. Chlordiazepoxide hydrochloride is 7-chloro-2- (methylamino)-5-phenyl-3 H -1,4-benzodiazepine 4-oxide hydrochloride. A white to practically white crystalline substance, it is soluble in water. It is unstable in solution and the powder must be protected from light. The structural formula is: C 16 H 14 ClN 3 O • HCl M.W. 336.22 Each capsule, for oral administration, contains either 5 mg, 10 mg or 25 mg of chlordiazepoxide hydrochloride, USP and has the following inactive ingredients: anhydrous lactose, D&C yellow no. 10, FD&C blue no. 1, FD&C blue no. 1 aluminum lake, gelatin, hydrogenated vegetable oil, microcrystalline cellulose, pharmaceutical glaze, and titanium dioxide. The 5 mg and 25 mg also contain D&C yellow no. 10 aluminum lake, FD&C blue no. 2 aluminum lake, FD&C red no. 40 aluminum lake, propylene glycol, and synthetic black iron oxide. In addition, the 5 mg contains D&C red no. 33 and the 10 mg also contains butyl paraben, edetate calcium disodium, dimethyl polysiloxane, ethylene glycol monoethyl ether, FD&C red no. 40, methyl paraben, propyl paraben, sodium, sodium lauryl sulfate, sodium propionate, and soya lecithin. Chlordiazepoxide hydrochloride structural formula

Chlordiazepoxide hydrochloride is the prototype for the benzodiazepine compounds. It is a versatile therapeutic agent of proven value for the relief of anxiety. Chlordiazepoxide hydrochloride is among the safer of the effective psychopharmacologic compounds available, as demonstrated by extensive clinical evidence. Chlordiazepoxide hydrochloride is 7-chloro-2- (methylamino)-5-phenyl-3 H -1,4-benzodiazepine 4-oxide hydrochloride. A white to practically white crystalline substance, it is soluble in water. It is unstable in solution and the powder must be protected from light. The structural formula is: C 16 H 14 ClN 3 O • HCl M.W. 336.22 Each capsule, for oral administration, contains either 5 mg, 10 mg or 25 mg of chlordiazepoxide hydrochloride, USP and has the following inactive ingredients: anhydrous lactose, D&C yellow no. 10, FD&C blue no. 1, FD&C blue no. 1 aluminum lake, gelatin, hydrogenated vegetable oil, microcrystalline cellulose, pharmaceutical glaze, and titanium dioxide. The 5 mg and 25 mg also contain D&C yellow no. 10 aluminum lake, FD&C blue no. 2 aluminum lake, FD&C red no. 40 aluminum lake, propylene glycol, and synthetic black iron oxide. In addition, the 5 mg contains D&C red no. 33 and the 10 mg also contains butyl paraben, edetate calcium disodium, dimethyl polysiloxane, ethylene glycol monoethyl ether, FD&C red no. 40, methyl paraben, propyl paraben, sodium, sodium lauryl sulfate, sodium propionate, and soya lecithin. Chlordiazepoxide hydrochloride structural formula

Each tablet, for oral administration, contains 0.5 mg, 1 mg, or 2 mg clonazepam, USP, a benzodiazepine. Each tablet also contains corn starch, lactose monohydrate, magnesium stearate, microcrystalline cellulose, and povidone. Clonazepam tablets USP 0.5 mg contain Yellow D&C No. 10 Aluminum Lake. Clonazepam tablets USP 1 mg contain Yellow D&C No. 10 Aluminum Lake, as well as FD&C Blue No. 1 Aluminum Lake. Chemically, clonazepam, USP is 5-( o -chlorophenyl)-1,3-dihydro-7-nitro-2 H -1,4-benzodiazepin-2-one. It is a light yellow crystalline powder. It has the following structural formula: C 15 H 10 ClN 3 O 3 M.W. 315.72 chemicalstructure.jpg

Clonazepam Tablets, USP, a benzodiazepine, is available as scored tablet with debossing Λ containing 0.5 mg of clonazepam and unscored tablets with debossing Λ and Λ containing 1 mg or 2 mg of clonazepam respectively. Each tablet also contains lactose monohydrate, polyethylene 66 67 69 glycol, microcrystalline cellulose, croscarmellose sodium and magnesium stearate, with the following colourants: 0.5 mg-FD & C Yellow 6 Al Lake, D & C Yellow 10 Al Lake; 1 mg-FD & C Blue 1 Al lake and FD & C Blue 2 Al lake Chemically, clonazepam is 5-(2-chlorophenyl)-1,3-dihydro-7-nitro- 2H -1,4-benzodiazepin-2-one. It is a light yellow crystalline powder. It has a molecular weight of 315.72 and the following structural formula: image description

Diazepam Tablets USP are a benzodiazepine derivative. Chemically, diazepam, USP is 7-chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one. It is a colorless to light yellow crystalline compound, and is insoluble in water. Its structural formula is: C 16 H 13 ClN 2 O M.W. 284.75 Diazepam Tablets USP are available as 2 mg, 5 mg, and 10 mg tablets for oral administration and contain the following inactive ingredients: anhydrous lactose, colloidal silicon dioxide; colorants: 5 mg only (D&C Yellow No. 10 aluminum lake and FD&C Yellow No. 6); 10 mg only (FD&C Blue No. 1 aluminum lake); magnesium stearate, microcrystalline cellulose, pregelatinized corn starch, and sodium starch glycolate. Diazepam Structural Formula

Diazepam is a benzodiazepine derivative. The chemical name of diazepam is 7-Chloro-1,3-dihydro-1-methyl-5-phenyl-2 H -1,4-benzodiazepin-2-one. It is a colorless to light yellow crystalline compound, insoluble in water. The molecular formula is C 16 H 13 ClN 2 O and the molecular weight is 284.74. The structural formula is as follows: Diazepam is available for oral administration as tablets containing 2 mg, 5 mg or 10 mg diazepam, USP. In addition to the active ingredient diazepam, each tablet contains the following inactive ingredients: colloidal silicon dioxide, magnesium stearate, microcrystalline cellulose, pregelatinized starch (corn) and sodium lauryl sulfate. The 5 mg tablets also contain FD&C Yellow No. 6 Aluminum Lake. The 10 mg tablets also contain D&C Yellow No. 10 Aluminum Lake and FD&C Blue No. 1 Aluminum Lake. Diazepam Structural Formula

Diazepam Tablets USP are a benzodiazepine derivative. Chemically, diazepam, USP is 7-chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one. It is a colorless to light yellow crystalline compound, and is insoluble in water. Its structural formula is: C 16 H 13 ClN 2 O M.W. 284.75 Diazepam Tablets USP are available as 2 mg, 5 mg, and 10 mg tablets for oral administration and contain the following inactive ingredients: anhydrous lactose, colloidal silicon dioxide; colorants: 5 mg only (D&C Yellow No. 10 aluminum lake and FD&C Yellow No. 6); 10 mg only (FD&C Blue No. 1 aluminum lake); magnesium stearate, microcrystalline cellulose, pregelatinized corn starch, and sodium starch glycolate. Diazepam Structural Formula

Lorazepam, an antianxiety agent, has the chemical formula, 7-chloro-5-( o -chlorophenyl)-1,3-dihydro-3-hydroxy-2 H -1,4-benzodiazepin-2-one: It is a nearly white powder almost insoluble in water. Each Lorazepam tablet, to be taken orally, contains 0.5 mg, 1 mg, or 2 mg of lorazepam. The inactive ingredients present are lactose anhydrous, microcrystalline cellulose, polacrilin potassium and magnesium stearate. Lorazepam structure

The barbiturates are nonselective central nervous system (CNS) depressants that are primarily used as sedative-hypnotics. In subhypnotic doses, they are also used as anticonvulsants. The barbiturates and their sodium salts are subject to control under the Federal Controlled Substances Act. Phenobarbital is a barbituric acid derivative and occurs as white, odorless, small crystals or crystalline powder that is very slightly soluble in water; soluble in alcohol, in ether, and in solutions of fixed alkali hydroxides and carbonates; sparingly soluble in chloroform. Phenobarbital is 5-ethyl-5-phenylbarbituric acid. Phenobarbital is a substituted pyrimidine derivative in which the basic structure is barbituric acid, a substance that has no CNS activity. CNS activity is obtained by substituting alkyl, alkenyl, or aryl groups on the pyrimidine ring. It has the following structural formula: Each phenobarbital tablet contains 16.2 mg, 32.4 mg, 64.8 mg or 97.2 mg of phenobarbital. In addition each tablet contains: colloidal silicon dioxide, lactose monohydrate, magnesium stearate, microcrystalline cellulose and sodium starch glycolate. This is the image of the structual formula for Phenobarbital.

The barbiturates are nonselective central nervous system (CNS) depressants that are primarily used as sedative-hypnotics. In subhypnotic doses, they are also used as anticonvulsants. The barbiturates and their sodium salts are subject to control under the Federal Controlled Substances Act. Phenobarbital is a barbituric acid derivative and occurs as white, odorless, small crystals or crystalline powder that is very slightly soluble in water; soluble in alcohol, in ether, and in solutions of fixed alkali hydroxides and carbonates; sparingly soluble in chloroform. Phenobarbital is 5-ethyl-5-phenylbarbituric acid. Phenobarbital is a substituted pyrimidine derivative in which the basic structure is barbituric acid, a substance that has no CNS activity. CNS activity is obtained by substituting alkyl, alkenyl, or aryl groups on the pyrimidine ring. It has the following structural formula: Each phenobarbital tablet contains 16.2 mg (1/4 grain), 32.4 mg (1/2 grain), 64.8 mg (1 grain) or 97.2 mg (11/2 grain) of phenobarbital. In addition each tablet contains: colloidal silicon dioxide, lactose monohydrate, magnesium stearate, microcrystalline cellulose and sodium starch glycolate. This is the image of the structual formula for Phenobarbital.