General Information of Drug (ID: DMZA017)

Drug Name
Tetracycline
Synonyms
Amycin; Biocycline; Bristaciclin; Bristaciclina; Bristacycline; Ciclibion; Copharlan; Cyclomycin; Cytome; Dumocyclin; Enterocycline; Medocycline; Resteclin; Robitet; Sanclomycine; Tetrachel; Veracin; Bristaciclin alpha; Cefracycline suspension; Component of Tetrastatin; Sumycin syrup; Tetracycline Free Base; Tetracycline I; Tetracycline II; Tetracycline Monohydrochloride; Achromycin (naphthacene derivative); Achromycin, naphthacene derivative; Centet (base); Lemtrex (base); Liquamycin (Veterinary); Liquamycin, veterinary; Panmycin (TN); Piracaps (base); Polycycline (VAN); Polycycline (antibiotic); Polycycline, antibiotic; SK-Tetracycline; Sumycin (TN); T-125; Tetra-Co; Tetraciclina [INN-Spanish]; Tetracycline & VRC3375; Tetracycline (internal use); Tetracyclinum [INN-Latin]; Tetracyn (TN); Vetquamycin-324 (free base); Tetracycline (JAN/USP/INN); Tetracycline [USAN:INN:BAN:JAN]; Methyl-1,11-dioxo-2-naphthacenecarboxamide; 6-Methyl-1,11-dioxy-2-naphthacenecarboxamide
Indication
Disease Entry ICD 11 Status REF
Bacterial infection 1A00-1C4Z Approved [1]
Therapeutic Class
Antibiotics
Drug Type
Small molecular drug
Structure
3D MOL 2D MOL
#Ro5 Violations (Lipinski): 1 Molecular Weight (mw) 444.4
Topological Polar Surface Area (xlogp) -2
Rotatable Bond Count (rotbonds) 2
Hydrogen Bond Donor Count (hbonddonor) 6
Hydrogen Bond Acceptor Count (hbondacc) 9
ADMET Property
BDDCS Class
Biopharmaceutics Drug Disposition Classification System (BDDCS) Class 3: high solubility and low permeability [2]
Bioavailability
77% of drug becomes completely available to its intended biological destination(s) [3]
Clearance
The drug present in the plasma can be removed from the body at the rate of 1.5 mL/min/kg [4]
Elimination
58% of drug is excreted from urine in the unchanged form [2]
Half-life
The concentration or amount of drug in body reduced by one-half in 6 - 12 hours [4]
Metabolism
The drug is not metabolised [5]
MRTD
The Maximum Recommended Therapeutic Dose (MRTD) of drug that ensured maximising efficacy and moderate side effect is 74.92487 micromolar/kg/day [6]
Unbound Fraction
The unbound fraction of drug in plasma is 0.78% [4]
Vd
Fluid volume that would be required to contain the amount of drug present in the body at the same concentration as in the plasma 1.2 L/kg [4]
Water Solubility
The ability of drug to dissolve in water is measured as 1.7 mg/mL [2]
Chemical Identifiers
Formula
C22H24N2O8
IUPAC Name
(4S,4aS,5aS,6S,12aR)-4-(dimethylamino)-1,6,10,11,12a-pentahydroxy-6-methyl-3,12-dioxo-4,4a,5,5a-tetrahydrotetracene-2-carboxamide
Canonical SMILES
C[C@@]1([C@H]2C[C@H]3[C@@H](C(=O)C(=C([C@]3(C(=O)C2=C(C4=C1C=CC=C4O)O)O)O)C(=O)N)N(C)C)O
InChI
InChI=1S/C22H24N2O8/c1-21(31)8-5-4-6-11(25)12(8)16(26)13-9(21)7-10-15(24(2)3)17(27)14(20(23)30)19(29)22(10,32)18(13)28/h4-6,9-10,15,25-26,29,31-32H,7H2,1-3H3,(H2,23,30)/t9-,10-,15-,21+,22-/m0/s1
InChIKey
NWXMGUDVXFXRIG-WESIUVDSSA-N
Cross-matching ID
PubChem CID
54675776
ChEBI ID
CHEBI:27902
CAS Number
60-54-8
DrugBank ID
DB00759
TTD ID
D08NQZ
VARIDT ID
DR00127
ACDINA ID
D00668

Molecular Interaction Atlas of This Drug


Drug Therapeutic Target (DTT)
DTT Name DTT ID UniProt ID MOA REF
Staphylococcus 30S ribosomal subunit (Stap-coc pbp2) TTQ8KVI F4NA87_STAAU Binder [7]

Drug Transporter (DTP)
DTP Name DTP ID UniProt ID MOA REF
Organic anion transporter 2 (SLC22A7) DT0OC1Q S22A7_HUMAN Substrate [8]
Organic anion transporter 4 (SLC22A11) DT06JWZ S22AB_HUMAN Substrate [8]
Breast cancer resistance protein (ABCG2) DTI7UX6 ABCG2_HUMAN Substrate [9]
Organic anion transporter 3 (SLC22A8) DTVP67E S22A8_HUMAN Substrate [8]
P-glycoprotein 1 (ABCB1) DTUGYRD MDR1_HUMAN Substrate [10]
Molecular Interaction Atlas (MIA) Jump to Detail Molecular Interaction Atlas of This Drug

Drug-Drug Interaction (DDI) Information of This Drug

Coadministration of a Drug Treating the Disease Different from Tetracycline (Comorbidity)
DDI Drug Name DDI Drug ID Severity Mechanism Comorbidity REF
Remdesivir DMBFZ6L Moderate Increased risk of hepatotoxicity by the combination of Tetracycline and Remdesivir. 1D6YCoronavirus Disease 2019 [1D6YCoronavirus Disease 2019] [60]
Sodium bicarbonate DMMU6BJ Moderate as urine pH determines the ionization state of weakly acidic or weakly alkaline drugs. Tetracycline caused by Sodium bicarbonate mediated altered urine pH. Acidosis [5C73] [61]
Tromethamine DMOBLGK Moderate as urine pH determines the ionization state of weakly acidic or weakly alkaline drugs. Tetracycline caused by Tromethamine mediated altered urine pH. Acidosis [5C73] [61]
Isotretinoin DM4QTBN Major Increased risk of pseudotumor cerebri by the combination of Tetracycline and Isotretinoin. Acne vulgaris [ED80] [62]
Bedaquiline DM3906J Moderate Increased risk of hepatotoxicity by the combination of Tetracycline and Bedaquiline. Antimicrobial drug resistance [MG50-MG52] [63]
Aminophylline DML2NIB Moderate Decreased metabolism of Tetracycline caused by Aminophylline mediated inhibition of CYP450 enzyme. Asthma [CA23] [64]
Pexidartinib DMS2J0Z Major Increased risk of hepatotoxicity by the combination of Tetracycline and Pexidartinib. Bone/articular cartilage neoplasm [2F7B] [65]
Mestranol DMG3F94 Moderate Decreased absorption of Tetracycline due to formation of complexes caused by Mestranol. Contraceptive management [QA21] [66]
Atracurium DM42HXN Moderate Additive neuromuscular blocking effects by the combination of Tetracycline and Atracurium. Corneal disease [9A76-9A78] [67]
Mivacurium DM473VD Moderate Additive neuromuscular blocking effects by the combination of Tetracycline and Mivacurium. Corneal disease [9A76-9A78] [67]
Pancuronium DMB0VY8 Moderate Additive neuromuscular blocking effects by the combination of Tetracycline and Pancuronium. Corneal disease [9A76-9A78] [67]
Oxtriphylline DMLHSE3 Moderate Decreased metabolism of Tetracycline caused by Oxtriphylline mediated inhibition of CYP450 enzyme. Cough [MD12] [64]
Mycophenolic acid DMU65NK Moderate Altered absorption of Tetracycline due to GI flora changes caused by Mycophenolic acid. Crohn disease [DD70] [68]
SODIUM CITRATE DMHPD2Y Moderate as urine pH determines the ionization state of weakly acidic or weakly alkaline drugs. Tetracycline caused by SODIUM CITRATE mediated altered urine pH. Discovery agent [N.A.] [61]
Digitoxin DMWVIGP Moderate Altered absorption of Tetracycline due to GI flora changes caused by Digitoxin. Heart failure [BD10-BD1Z] [69]
Mipomersen DMGSRN1 Major Increased risk of hepatotoxicity by the combination of Tetracycline and Mipomersen. Hyper-lipoproteinaemia [5C80] [70]
BMS-201038 DMQTAGO Major Increased risk of hepatotoxicity by the combination of Tetracycline and BMS-201038. Hyper-lipoproteinaemia [5C80] [71]
Quinapril DMR8H31 Moderate Decreased absorption of Tetracycline due to formation of complexes caused by Quinapril. Hypertension [BA00-BA04] [72]
Sodium acetate anhydrous DMH21E0 Moderate as urine pH determines the ionization state of weakly acidic or weakly alkaline drugs. Tetracycline caused by Sodium acetate anhydrous mediated altered urine pH. Hypo-osmolality/hyponatraemia [5C72] [61]
Iron DMAP8MV Moderate Decreased absorption of Tetracycline due to formation of complexes caused by Iron. Iron deficiency anaemia [3A00] [73]
Calaspargase pegol DMQZBXI Moderate Increased risk of hepatotoxicity by the combination of Tetracycline and Calaspargase pegol. Malignant haematopoietic neoplasm [2B33] [74]
Idelalisib DM602WT Moderate Increased risk of hepatotoxicity by the combination of Tetracycline and Idelalisib. Mature B-cell leukaemia [2A82] [75]
Ethinyl estradiol DMODJ40 Moderate Decreased absorption of Tetracycline due to formation of complexes caused by Ethinyl estradiol. Menopausal disorder [GA30] [66]
Lanthanum carbonate DMMJQSH Moderate Decreased absorption of Tetracycline due to formation of complexes caused by Lanthanum carbonate. Mineral absorption/transport disorder [5C64] [76]
Metoclopramide DMFA5MY Minor Altered absorption of Tetracycline due to GI dynamics variation caused by Metoclopramide. Nausea/vomiting [MD90] [60]
Ranitidine DM0GUSX Moderate Decreased absorption of Tetracycline due to formation of complexes caused by Ranitidine. Peptic ulcer [DA61] [77]
Vecuronium DMP0UK2 Moderate Additive neuromuscular blocking effects by the combination of Tetracycline and Vecuronium. Tonus and reflex abnormality [MB47] [67]
⏷ Show the Full List of 27 DDI Information of This Drug

Drug Inactive Ingredient(s) (DIG) and Formulation(s) of This Drug

DIG
DIG Name DIG ID PubChem CID Functional Classification
Allura red AC dye E00338 33258 Colorant
Benzyl alcohol E00010 244 Antimicrobial preservative; Solvent
Butylparaben E00142 7184 Antimicrobial preservative
D&C red no. 22 E00206 11048 Colorant
FD&C blue no. 1 E00263 19700 Colorant
FD&C blue no. 2 E00446 2723854 Colorant
methylparaben E00149 7456 Antimicrobial preservative
Propyl 4-hydroxybenzoate E00141 7175 Antimicrobial preservative
Quinoline yellow WS E00309 24671 Colorant
Sodium lauryl sulfate E00464 3423265 Emulsifying agent; Modified-release agent; Penetration agent; Solubilizing agent; Surfactant; lubricant
Stearic acid E00079 5281 Emulsifying agent; Solubilizing agent; Viscosity-controlling agent; lubricant
Sunset yellow FCF E00255 17730 Colorant
Ammonia E00007 222 Alkalizing agent
Beta-D-lactose E00099 6134 Diluent; Dry powder inhaler carrier; Lyophilization aid
Butyl alcohol E00011 263 Flavoring agent; Solvent
Edetate calcium disodium E00487 6093170 Complexing agent
Ethylene glycol ethyl ether E00164 8076 Solubilizing agent; Solvent
Ferrosoferric oxide E00231 14789 Colorant
Lactose monohydrate E00393 104938 Binding agent; Diluent; Dry powder inhaler carrier; Lyophilization aid
Magnesium stearate E00208 11177 lubricant
Propylene glycol E00040 1030 Antimicrobial preservative; Humectant; Plasticizing agent; Solvent
Silicon dioxide E00670 Not Available Anticaking agent; Opacifying agent; Viscosity-controlling agent
Sodium propionate E00445 2723816 Antimicrobial preservative
Soybean lecithin E00637 Not Available Other agent
Titanium dioxide E00322 26042 Coating agent; Colorant; Opacifying agent
Water E00035 962 Solvent
⏷ Show the Full List of 26 Pharmaceutical Excipients of This Drug
Pharmaceutical Formulation
Formulation Name Drug Dosage Dosage Form Route
Tetracycline 250 mg capsule 250 mg Oral Capsule Oral
Tetracycline 500 mg capsule 500 mg Oral Capsule Oral
Jump to Detail Pharmaceutical Formulation Page of This Drug

References

1 How many modes of action should an antibiotic have Curr Opin Pharmacol. 2008 Oct;8(5):564-73.
2 BDDCS applied to over 900 drugs
3 Critical Evaluation of Human Oral Bioavailability for Pharmaceutical Drugs by Using Various Cheminformatics Approaches
4 Trend Analysis of a Database of Intravenous Pharmacokinetic Parameters in Humans for 1352 Drug Compounds
5 FDA approval: ado-trastuzumab emtansine for the treatment of patients with HER2-positive metastatic breast cancer. Clin Cancer Res. 2014 Sep 1;20(17):4436-41.
6 Estimating the safe starting dose in phase I clinical trials and no observed effect level based on QSAR modeling of the human maximum recommended daily dose
7 The glycylcyclines: a comparative review with the tetracyclines. Drugs. 2004;64(1):63-88.
8 Human organic anion transporters mediate the transport of tetracycline. Jpn J Pharmacol. 2002 Jan;88(1):69-76.
9 Arginine-482 is not essential for transport of antibiotics, primary bile acids and unconjugated sterols by the human breast cancer resistance protein (ABCG2). Biochem J. 2005 Jan 15;385(Pt 2):419-26.
10 Mammalian drug efflux transporters of the ATP binding cassette (ABC) family in multidrug resistance: A review of the past decade. Cancer Lett. 2016 Jan 1;370(1):153-64.
11 Human intestinal transporter database: QSAR modeling and virtual profiling of drug uptake, efflux and interactions. Pharm Res. 2013 Apr;30(4):996-1007.
12 MDR1 (ABCB1) G1199A (Ser400Asn) polymorphism alters transepithelial permeability and sensitivity to anticancer agents. Cancer Chemother Pharmacol. 2009 Jun;64(1):183-8.
13 Folate transporter expression decreases in the human placenta throughout pregnancy and in pre-eclampsia. Pregnancy Hypertens. 2012 Apr;2(2):123-31.
14 Comparative studies on in vitro methods for evaluating in vivo function of MDR1 P-glycoprotein. Pharm Res. 2001 Dec;18(12):1660-8.
15 Antiestrogens and steroid hormones: substrates of the human P-glycoprotein. Biochem Pharmacol. 1994 Jul 19;48(2):287-92.
16 Association of genetic polymorphisms in the influx transporter SLCO1B3 and the efflux transporter ABCB1 with imatinib pharmacokinetics in patients with chronic myeloid leukemia. Ther Drug Monit. 2011 Apr;33(2):244-50.
17 Doxorubicin transport by RALBP1 and ABCG2 in lung and breast cancer. Int J Oncol. 2007 Mar;30(3):717-25.
18 Wild-type breast cancer resistance protein (BCRP/ABCG2) is a methotrexate polyglutamate transporter. Cancer Res. 2003 Sep 1;63(17):5538-43.
19 The effect of low pH on breast cancer resistance protein (ABCG2)-mediated transport of methotrexate, 7-hydroxymethotrexate, methotrexate diglutamate, folic acid, mitoxantrone, topotecan, and resveratrol in in vitro drug transport models. Mol Pharmacol. 2007 Jan;71(1):240-9.
20 Role of BCRP as a biomarker for predicting resistance to 5-fluorouracil in breast cancer. Cancer Chemother Pharmacol. 2009 May;63(6):1103-10.
21 Inhibiting the function of ABCB1 and ABCG2 by the EGFR tyrosine kinase inhibitor AG1478. Biochem Pharmacol. 2009 Mar 1;77(5):781-93.
22 Sterol transport by the human breast cancer resistance protein (ABCG2) expressed in Lactococcus lactis. J Biol Chem. 2003 Jun 6;278(23):20645-51.
23 The phytoestrogen genistein enhances multidrug resistance in breast cancer cell lines by translational regulation of ABC transporters. Cancer Lett. 2016 Jun 28;376(1):165-72.
24 Curcumin inhibits the activity of ABCG2/BCRP1, a multidrug resistance-linked ABC drug transporter in mice. Pharm Res. 2009 Feb;26(2):480-7.
25 Imatinib mesylate (STI571) is a substrate for the breast cancer resistance protein (BCRP)/ABCG2 drug pump. Blood. 2004 Nov 1;104(9):2940-2.
26 Transport of organic anions across the basolateral membrane of proximal tubule cells. Rev Physiol Biochem Pharmacol. 2003;146:95-158.
27 Transport mechanism and substrate specificity of human organic anion transporter 2 (hOat2 [SLC22A7]). J Pharm Pharmacol. 2005 May;57(5):573-8.
28 Human organic anion transporters and human organic cation transporters mediate renal transport of prostaglandins. J Pharmacol Exp Ther. 2002 Apr;301(1):293-8.
29 Human organic anion transporters and human organic cation transporters mediate renal antiviral transport. J Pharmacol Exp Ther. 2002 Mar;300(3):918-24.
30 Possible involvement of organic anion transporter 2 on the interaction of theophylline with erythromycin in the human liver. Drug Metab Dispos. 2005 May;33(5):619-22.
31 Identification of multispecific organic anion transporter 2 expressed predominantly in the liver. FEBS Lett. 1998 Jun 12;429(2):179-82.
32 Organic anion transporter 2 (SLC22A7) is a facilitative transporter of cGMP. Mol Pharmacol. 2008 Apr;73(4):1151-8.
33 A species difference in the transport activities of H2 receptor antagonists by rat and human renal organic anion and cation transporters. J Pharmacol Exp Ther. 2005 Oct;315(1):337-45.
34 Human organic anion transporter 2 is an entecavir, but not tenofovir, transporter. Drug Metab Pharmacokinet. 2017 Feb;32(1):116-119.
35 Methotrexate-loxoprofen interaction: involvement of human organic anion transporters hOAT1 and hOAT3. Drug Metab Pharmacokinet. 2004 Oct;19(5):369-74.
36 Identification and characterization of human organic anion transporter 3 expressing predominantly in the kidney. Mol Pharmacol. 2001 May;59(5):1277-86.
37 Prediction of the overall renal tubular secretion and hepatic clearance of anionic drugs and a renal drug-drug interaction involving organic anion transporter 3 in humans by in vitro uptake experiments. Drug Metab Dispos. 2011 Jun;39(6):1031-8.
38 Murine renal organic anion transporters mOAT1 and mOAT3 facilitate the transport of neuroactive tryptophan metabolites. Am J Physiol Cell Physiol. 2005 Nov;289(5):C1075-84.
39 Organic anion transporter 3 is involved in the brain-to-blood efflux transport of thiopurine nucleobase analogs. J Neurochem. 2004 Aug;90(4):931-41.
40 Transporter-mediated influx and efflux mechanisms of pitavastatin, a new inhibitor of HMG-CoA reductase. J Pharm Pharmacol. 2005 Oct;57(10):1305-11.
41 The contribution of organic anion transporters OAT1 and OAT3 to the renal uptake of rosuvastatin. J Pharmacol Exp Ther. 2007 Sep;322(3):1221-7.
42 Aspirin and probenecid inhibit organic anion transporter 3-mediated renal uptake of cilostazol and probenecid induces metabolism of cilostazol in the rat. Drug Metab Dispos. 2014 Jun;42(6):996-1007.
43 Characterization of methotrexate transport and its drug interactions with human organic anion transporters. J Pharmacol Exp Ther. 2002 Aug;302(2):666-71.
44 The role of the intracellular glutamate gradient in driving organic anion transporter function.
45 Inhibition of human organic anion transporter 3 mediated pravastatin transport by gemfibrozil and the metabolites in humans. Xenobiotica. 2007 Apr;37(4):416-26.
46 Interactions of human organic anion transporters with diuretics. J Pharmacol Exp Ther. 2004 Mar;308(3):1021-9.
47 Inhibitory effects of angiotensin II receptor antagonists and leukotriene receptor antagonists on the transport of human organic anion transporter 4. J Pharm Pharmacol. 2006 Nov;58(11):1499-505.
48 Cellular Uptake of Levocetirizine by Organic Anion Transporter 4. J Pharm Sci. 2017 Sep;106(9):2895-2898.
49 Involvement of uric acid transporters in alteration of serum uric acid level by angiotensin II receptor blockers. Pharm Res. 2008 Mar;25(3):639-46.
50 Characterization of a 30S ribosomal subunit assembly intermediate found in Escherichia coli cells growing with neomycin or paromomycin. Arch Microbiol. 2008 May;189(5):441-9.
51 Ribosomal resistance in the gentamicin producer organism Micromonospora purpurea. Antimicrob Agents Chemother. 1982 Aug;22(2):231-6.
52 Bacterial resistance to aminoglycosides and beta-lactams: the Tn1331 transposon paradigm. Front Biosci. 2000 Jan 1;5:D20-9.
53 Molecular dynamics simulations of the 30S ribosomal subunit reveal a preferred tetracycline binding site. J Am Chem Soc. 2008 Jan 30;130(4):1114-5.
54 Functional insights from the structure of the 30S ribosomal subunit and its interactions with antibiotics. Nature. 2000 Sep 21;407(6802):340-8.
55 Aminoglycoside association pathways with the 30S ribosomal subunit. J Phys Chem B. 2009 May 21;113(20):7322-30.
56 Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34.
57 Reversed-phase high-performance liquid chromatography coupled to ultraviolet and electrospray time-of-flight mass spectrometry on-line detection fo... J Chromatogr A. 2008 Jun 27;1195(1-2):107-16.
58 Detection of tetracycline resistance genes by PCR methods. Methods Mol Biol. 2004;268:3-13.
59 Functional, biophysical, and structural bases for antibacterial activity of tigecycline. Antimicrob Agents Chemother. 2006 Jun;50(6):2156-66.
60 Cerner Multum, Inc. "Australian Product Information.".
61 Elliott GR "Sodium bicarbonate and oral tetracycline." Clin Pharmacol Ther 13 (1972): 459. [PMID: 5026384]
62 Gardner K, Cox T, Digre KB "Idiopathic intracranial hypertension associated with tetracycline use in fraternal twins: case reports and review." Neurology 45 (1995): 6-10. [PMID: 7824136]
63 Product Information. Sirturo (bedaquiline). Janssen Pharmaceuticals, Titusville, NJ.
64 Gotz VP, Ryerson GG "Evaluation of tetracycline on theophylline disposition in patients with chronic obstructive airways disease." Drug Intell Clin Pharm 20 (1986): 694-6. [PMID: 3757782]
65 Product Information. Turalio (pexidartinib). Daiichi Sankyo, Inc., Parsippany, NJ.
66 Friedman CI, Huneke AL, Kim MH, Powell J "The effect of ampicillin on oral contraceptive effectiveness." Obstet Gynecol 55 (1980): 33-7. [PMID: 7188714]
67 Multum Information Services, Inc. Expert Review Panel.
68 Product Information. CellCept (mycophenolate mofetil). Roche Laboratories, Nutley, NJ.
69 Lindenbaum J, Rund DG, Butler VP Jr, Tse-Eng D, Saha JR "Inactivation of digoxin by the gut flora: reversal by antibiotic therapy." N Engl J Med 305 (1981): 789-94. [PMID: 7266632]
70 Product Information. Kynamro (mipomersen). Genzyme Corporation, Cambridge, MA.
71 Product Information. Juxtapid (lomitapide). Aegerion Pharmaceuticals Inc, Cambridge, MA.
72 Cerner Multum, Inc. "UK Summary of Product Characteristics.".
73 Campbell NR, Hasinoff BB "Iron supplements: a common cause of drug interactions." Br J Clin Pharmacol 31 (1991): 251-5. [PMID: 2054263]
74 Al-Nawakil C, Willems L, Mauprivez C, et.al "Successful treatment of l-asparaginase-induced severe acute hepatotoxicity using mitochondrial cofactors." Leuk Lymphoma 55 (2014): 1670-4. [PMID: 24090500]
75 Product Information. Zydelig (idelalisib). Gilead Sciences, Foster City, CA.
76 Canadian Pharmacists Association.
77 Albert KS, Welch RD, DeSante KA, DiSanto AR "Decreased tetracycline bioavailability caused by a bismuth subsalicylate antidiarrheal mixture." J Pharm Sci 68 (1979): 586-8. [PMID: 435335]