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(Click for frequent words.) 72 macrolide antibiotic 72 beta lactam antibiotic 71 quinolone antibiotic 71 Fluconazole 71 poliovirus vaccine 71 meropenem 71 Artesunate 70 zidovudine AZT 70 Levofloxacin 70 cefdinir 70 protease inhibitor PI 69 Sustiva efavirenz 69 amphotericin B 69 Itraconazole 69 Epivir 69 #mg capsules [001] 69 efavirenz emtricitabine 69 Pradaxa ® 69 Rimantadine 69 candidemia 68 Artemether 68 Noxafil 68 STELARA ™ 68 voriconazole 68 ritonavir boosted 68 tetracycline antibiotic 68 quinolone 68 Rifampicin 68 Darunavir 68 tenofovir Viread 68 atovaquone 68 Azathioprine 68 EMEND 68 nucleotide analogue 68 Saquinavir 68 cidofovir 68 salmeterol fluticasone 68 Zerit 68 TYGACIL 68 Valcyte 68 Eraxis 68 Trimethoprim 68 Gatifloxacin 68 protease inhibitors PIs 68 tinidazole 67 Sporanox 67 Moxifloxacin 67 ethambutol 67 Pentacel vaccine 67 cotrimoxazole 67 Fluticasone 67 Hydrochlorothiazide 67 indinavir Crixivan 67 Amodiaquine 67 CANCIDAS 67 Budesonide 67 tenofovir DF 67 pegylated interferon alfa 67 clomipramine 67 cefuroxime 67 efalizumab 67 inhalation powder 67 Abacavir 67 sulfamethoxazole 67 atazanavir Reyataz 67 pyrimethamine 67 intranasal corticosteroid 67 imipenem 67 Haemophilus b Conjugate 67 SPRIX ® 67 Dabigatran etexilate 67 Cefixime 67 Didanosine 67 caspofungin 67 intravenous immunoglobulin IVIg 67 valganciclovir 67 Daptomycin 67 Tigecycline 67 Rifampin 67 KETEK 67 trimethoprim 67 sulindac 67 tazobactam 67 haloperidol Haldol 67 Vfend 67 lamivudine zidovudine 67 quinolone antibiotics 67 topical ocular 67 maleate 67 gatifloxacin 67 Lubiprostone 67 BeneFIX 67 Metronidazole 67 Kuvan sapropterin dihydrochloride 67 steroid dexamethasone 67 nitrofurantoin 67 clotrimazole 67 lamivudine 3TC 67 Ganciclovir 67 betamethasone dipropionate 67 Cyclosporine 67 rifabutin 67 Kivexa 67 cefepime 67 Entecavir 67 proguanil 67 Ketorolac 67 pyrazinamide 67 darunavir r 66 ganciclovir 66 Valtrex valacyclovir 66 indinavir 66 SMZ TMP 66 piperacillin tazobactam 66 antifungal agent 66 docetaxel Taxotere ® 66 Toxoid 66 clobazam 66 sulfonamide 66 SCIg 66 daptomycin 66 Teriparatide 66 Suppositories 66 octreotide acetate 66 INVANZ 66 fluoroquinolone antibiotic 66 lumefantrine 66 Cancidas 66 abacavir lamivudine 66 nelfinavir Viracept 66 dapsone 66 miconazole 66 mupirocin 66 CRIXIVAN 66 Nelfinavir 66 Gentamicin 66 neuraminidase inhibitor 66 Nitazoxanide 66 fluticasone furoate 66 diclofenac sodium 66 tigecycline 66 Alinia 66 TMP SMX 66 Mycamine 66 CellCept mycophenolate mofetil 66 Dacogen decitabine 66 Losartan 66 sodium stibogluconate 66 NRTI backbone 66 Venlafaxine 66 interferon alfa 2b 66 MenACWY 66 MYCAMINE 66 prescription laxative 66 AZT 3TC 66 Vivaglobin 66 Etravirine 66 Clindamycin 66 flutamide 66 intradermal injection 66 azelastine 66 microtubule inhibitor 66 IXEMPRA 66 ceftazidime 66 Tygacil 66 Topotecan 66 thalidomide Thalomid 66 Remicade infliximab 66 sublingual tablets 66 nucleoside analog 66 artemisinin derivative 65 anagrelide 65 Atazanavir 65 Filgrastim 65 Lopinavir ritonavir 65 ribavirin Copegus 65 efavirenz Sustiva 65 Tindamax 65 ritonavir boosted protease inhibitor 65 Pegasys peginterferon alfa 2a 65 timolol maleate 65 palivizumab 65 Intelence 65 co trimoxazole 65 nevirapine Viramune 65 Lansoprazole 65 abacavir sulfate lamivudine 65 terfenadine 65 gliclazide 65 Cotrimoxazole 65 primaquine 65 griseofulvin 65 Piperacillin 65 Rocephin 65 amoxicillin clavulanic acid 65 Belerofon 65 leukotriene receptor antagonist 65 sorafenib Nexavar 65 loperamide 65 Vaprisol 65 tacrolimus ointment 65 Ampicillin 65 Bicalutamide 65 anticoagulant warfarin 65 suppressive therapy 65 azithromycin 65 Nifedipine 65 pralidoxime 65 Vidaza azacitidine 65 Oropharyngeal Candidiasis 65 prochlorperazine 65 MYOBLOC 65 Minocycline 65 Maleate 65 buccal tablet 65 mometasone furoate 65 long acting bronchodilator 65 abacavir Ziagen 65 Ofloxacin 65 Keppra XR 65 insulin glulisine 65 zafirlukast 65 Arranon 65 astemizole 65 Edurant 65 amprenavir 65 beta agonist 65 Intravenous immunoglobulin 65 tenofovir TDF 65 Kepivance 65 CYT# QbG# 65 ibandronate 65 polysaccharide vaccine 65 mycophenolate mofetil 65 beclomethasone dipropionate 65 Dasatinib 65 levocetirizine 65 ZYVOX 65 Terbinafine 65 Indomethacin 65 AVELOX 65 combination antiretroviral therapy 65 Mg Uk 65 Atomoxetine 65 biologic DMARD 65 Taxotere docetaxel 65 Gilead Viread 65 LYSTEDA 65 quetiapine Seroquel 65 dihydrochloride 65 Montelukast 65 Fingolimod 65 clavulanic acid 65 immunosuppressant drug 65 ciprofloxacin hydrochloride 65 tetanus toxoid 65 Melphalan 65 low dose ritonavir 65 relapsed MM 65 Immune Globulin 65 EFFEXOR XR 65 #mg/#mg 65 reuptake inhibitor 65 etanercept Enbrel 65 Levetiracetam 65 nucleoside analogs 65 paroxetine Paxil 65 Valacyclovir 65 ganciclovir ophthalmic gel 65 oxcarbazepine 65 INTELENCE 65 Azithromycin 65 adalimumab Humira 65 Lamivudine Zidovudine 65 ceftriaxone 65 invasive candidiasis 65 Zirgan 65 infliximab Remicade 64 ribavirin USP 64 Zileuton 64 artemesinin 64 Eltrombopag 64 penicillin G benzathine 64 GnRH agonists 64 Desmopressin 64 Cefazolin 64 Pafuramidine 64 Parnate 64 artemether 64 efavirenz EFV 64 phosphodiesterase inhibitor 64 Irinotecan 64 mometasone 64 MenACWY CRM 64 ZIAGEN 64 Miacalcin 64 norfloxacin 64 Raltegravir 64 nonnucleoside reverse transcriptase inhibitors 64 Prilosec omeprazole 64 norethindrone 64 ZOMIG 64 leflunomide 64 esomeprazole Nexium 64 APTIVUS 64 desmopressin 64 enalapril 64 anti androgen 64 piroxicam 64 Kaletra tablets 64 moxifloxacin HCl 64 Orally administered 64 ipratropium bromide 64 flecainide 64 metformin hydrochloride 64 metformin HCl 64 antibiotic amoxicillin 64 COMBIVIR 64 Tarceva TM 64 prednisolone acetate 64 Levothyroxine 64 losartan potassium 64 Tacrolimus 64 levofloxacin 64 dexamethasone Decadron 64 cefixime 64 fluticasone salmeterol 64 levetiracetam 64 ketorolac 64 Methylnaltrexone 64 synthetic progestin 64 Amlodipine 64 acarbose 64 gemifloxacin 64 pioglitazone HCl 64 Cefepime 64 adefovir dipivoxil 64 Dextromethorphan 64 lansoprazole 64 Telithromycin 64 Topical Gel 64 KINRIX 64 conjugate vaccines 64 lyophilized powder 64 Mestinon 64 ergotamine 64 nelfinavir 64 ORENCIA ® 64 Pemetrexed 64 Engerix B 64 paclitaxel Taxol 64 lopinavir 64 piperacillin 64 Fortovase 64 alefacept 64 glibenclamide 64 trospium chloride 64 orally inhaled 64 subcutaneous immunoglobulin 64 Ciclesonide 64 oral iron chelator 64 Ceftriaxone 64 atazanavir sulfate 64 fosamprenavir 64 itraconazole Sporanox 64 ergot derivatives 64 betamethasone 64 intradermal delivery 64 cefotaxime 64 Gamunex C 64 sertraline Zoloft 64 Capecitabine 64 omalizumab 64 echinocandin 64 Privigen 64 Hib vaccines 64 atorvastatin #mg 64 SIMCOR 64 Uroxatral 64 5mg/kg 64 stavudine d4T 64 Fluticasone Propionate 64 lopinavir ritonavir 64 VARIVAX 64 Interferon beta 1b 64 Formoterol 64 allergen immunotherapy 64 dimeglumine 64 Telzir 64 ZOLINZA 64 Ziprasidone 64 generation cephalosporins 64 divalproex sodium 64 rilonacept 64 anticonvulsant medications 64 Zidovudine 64 Clindesse 64 AZT zidovudine Retrovir 64 Levoleucovorin 64 nitroprusside 64 Sitagliptin 64 BenzaClin R 64 acellular pertussis 64 Interferon alpha 64 clozapine Clozaril 64 Nilotinib 64 venlafaxine Effexor 64 Allopurinol 64 Posaconazole 64 oral rivaroxaban 64 Hydralazine 64 Captopril 64 PULMICORT RESPULES 64 idraparinux 64 Liprotamase 64 fluvastatin 64 oral ribavirin 64 topical ophthalmic 64 imiquimod cream 64 COZAAR 64 acyclovir Zovirax 64 pioglitazone hydrochloride 64 Oral corticosteroids 64 Brimonidine 64 AERIUS 64 hydrochloride capsules 64 sitagliptin phosphate 63 #.#mg 1mg 63 injectable formulations 63 basiliximab 63 #mg tablet [002] 63 Lysteda 63 dosing frequency 63 acitretin 63 P. falciparum malaria 63 Cimetidine 63 serotonin norepinephrine reuptake inhibitor 63 MEVACOR 63 Salicylic Acid 63 #mg doses [002] 63 aspirin clopidogrel 63 tipranavir 63 fumarate 63 Amantadine 63 Paromomycin 63 APTIVUS r 63 tenofovir emtricitabine 63 Ramelteon 63 Mycophenolate Mofetil 63 INVEGA ® 63 Hydroxyurea 63 amoxicillin clavulanate 63 ophthalmic ointment 63 intravenous bisphosphonates 63 pharmacologically active isomer 63 glatiramer acetate 63 toxoid 63 pregabalin Lyrica 63 Tipranavir 63 Salmeterol 63 #mg tablet [001] 63 miconazole Lauriad ® 63 diphtheria toxoid 63 Alvesco R 63 denileukin diftitox 63 Gonal f 63 ß blockers 63 Efudex 63 diclofenac Voltaren 63 Gliclazide 63 Certolizumab pegol 63 uncomplicated malaria 63 BYETTA exenatide injection 63 intranasal formulation 63 estradiol gel 63 pentoxifylline 63 sitagliptin metformin 63 Fluvastatin 63 Lamivudine 63 Degarelix 63 #/#mg 63 Inactivated 63 zolmitriptan 63 NOXAFIL 63 TNF alpha inhibitor 63 formoterol fumarate 63 Isentress raltegravir 63 CONCERTA 63 nasal spray formulation 63 monovalent vaccine 63 Proquin XR 63 ziconotide 63 benazepril 63 intravenous immunoglobulin 63 Malarone 63 Bacillus Calmette Guerin BCG 63 mesylate 63 vaccine LAIV 63 Exforge HCT 63 Nebulized 63 cephalosporin antibiotic 63 rifamycin 63 Leukine ® 63 Mometasone 63 nucleoside reverse transcriptase inhibitor 63 CCR5 inhibitor 63 LPV r 63 SGPT 63 Ritonavir 63 micafungin 63 topiramate Topamax 63 xanthine oxidase inhibitor 63 Crixivan 63 HMG CoA reductase inhibitors 63 Floxin 63 Cellcept 63 stavudine 63 Combination therapy 63 Lamotrigine 63 salmeterol fluticasone propionate 63 Ixiaro 63 Prednisolone 63 Bendamustine 63 oseltamivir Tamiflu ® 63 Zorbtive TM 63 paricalcitol 63 Sevelamer 63 Hydrochloride 63 iron chelator 63 atovaquone proguanil 63 MenC 63 HCl capsules 63 carbamazepine Tegretol 63 Taxol paclitaxel 63 XOPENEX Inhalation Solution 63 propafenone 63 cholestyramine 63 NXL# 63 Interferon alfa 63 REYATAZ R 63 tazarotene 63 Dynavax HBV vaccine 63 Tredaptive 63 Celebrex celecoxib 63 Alkeran 63 Ozurdex 63 Tetanus Toxoid 63 rosiglitazone maleate 63 fluvoxamine maleate 63 acetylcholinesterase inhibitor 63 Copegus ribavirin 63 Anastrozole 63 OROS ® 63 pharmacokinetic interactions 63 vinorelbine tartrate 63 myopathy rhabdomyolysis 63 Clarithromycin 63 atypical antipsychotic medication 63 trimethoprim sulfamethoxazole 63 orally disintegrating 63 Acyclovir 63 aripiprazole Abilify 63 Antihistamine 63 Anidulafungin 63 onabotulinumtoxinA 63 intravenous iv 63 calcineurin inhibitor 63 #mg Tablets [002] 63 Angioedema 63 Rilonacept 63 topical antifungal 63 inhaled corticosteroids ICS 63 Helicobacter pylori eradication 63 chlorthalidone 63 TREDAPTIVE 63 tobramycin 63 cefazolin 63 CYP#A# inhibitors 63 Increlex R 63 antineoplastic 63 metformin XR 63 ULORIC 63 Catapres 63 Mitoxantrone 63 SPIRIVA ® 63 Telmisartan 63 Topical Suspension 63 Bicillin CR 63 inhaled corticosteroid ICS 63 Amikacin 63 Zithromax azithromycin 63 Mg Usa 63 Lopinavir 63 lapatinib Tykerb 63 Pneumococcal vaccine 63 mebendazole 63 vecuronium 63 Tiotropium 63 Dapagliflozin 63 hydroxocobalamin 63 Rebetol 63 PREVNAR 63 Dalbavancin 63 Reuteri 63 dispersible tablet 63 hypercholesterolaemia 63 amphotericin 63 Proleukin 63 Lopinavir Ritonavir 63 trabectedin 63 tipranavir r 63 Elvitegravir 63 live attenuated influenza 63 saquinavir 63 granisetron 63 rituximab Rituxan 63 Zolinza 63 tegaserod 63 Tocilizumab 63 Levonorgestrel 63 subcutaneously injected 63 lovastatin Mevacor 63 alkylating agent 63 Perindopril 63 capsule formulation 63 leukotriene receptor antagonists 63 praziquantel 63 Coartem ® 63 MAXALT 63 cinacalcet 63 Sandimmune 63 Candesartan 63 Gefitinib 63 Pediarix 63 finasteride Proscar 63 antibiotics ciprofloxacin 63 ursodeoxycholic acid 63 oral rinse 63 Bosutinib 63 Pneumococcal Conjugate Vaccine 63 acetylsalicylic acid 63 DDAVP 63 Hyalgan 63 Monopril 63 Lactobacillus reuteri 63 recurrent genital herpes 63 Recombinant Human 63 zaleplon 63 peginterferon alpha 2a 63 Raptiva R 63 Captisol Enabled 63 daunorubicin 62 Velcade bortezomib 62 darunavir 62 amikacin 62 anthracycline chemotherapy 62 ACTOplus met XR 62 prucalopride 62 prasterone 62 ritonavir boosted atazanavir 62 Erlotinib 62 Cilostazol 62 peginterferon alfa 2a Pegasys 62 Kaletra lopinavir ritonavir 62 Fludara ® 62 Sanofi Pasteur Fluzone 62 bacitracin 62 Saizen R 62 Aliskiren 62 oral antifungal 62 valdecoxib 62 nadolol 62 recombinant interferon 62 Glucophage XR 62 JANUMET 62 inactivated vaccine 62 diuretic hydrochlorothiazide 62 Hepatitis B Vaccine 62 escitalopram oxalate 62 inhaled budesonide 62 RISPERDAL ® 62 Vimpat R 62 REMINYL ® 62 Genentech Rituxan 62 Mirtazapine 62 abacavir sulfate 62 acellular pertussis DTaP 62 Rofecoxib 62 BYSTOLIC 62 rabeprazole 62 beta lactam 62 artemether lumefantrine 62 Gilead Truvada 62 amantadine Symmetrel 62 Diamyd r 62 dihydroergotamine 62 BENICAR HCT 62 cephalosporin antibiotics 62 FXIII 62 trivalent vaccines 62 Isotretinoin 62 troglitazone 62 subcutaneously administered 62 pegylated interferon alpha 62 MetroGel 62 HIB vaccine 62 OMNARIS 62 investigational integrase inhibitor 62 adapalene 62 pimecrolimus 62 bezafibrate 62 DMARDS 62 cromolyn sodium 62 hydrocortisone 62 oxaliplatin Eloxatin 62 5 HT3 antagonist 62 Altabax 62 Protease inhibitor 62 Frovatriptan 62 pimozide 62 prilocaine 62 PREZISTA r 62 timolol 62 Hycamtin 62 INVIRASE 62 antiepileptics 62 oral antiviral 62 Pegintron 62 virosome 62 ciclesonide 62 psoriasis vulgaris 62 tenofovir disoproxil 62 Calcitriol 62 zoledronate 62 Mesalamine 62 soft gelatin capsule 62 DULERA 62 beta lactam antibiotics 62 QVAR R 62 quinolones 62 Pioglitazone 62 thiazide diuretic 62 ertapenem 62 MAGE A3 ASCI 62 myelodysplastic myeloproliferative diseases 62 valent pneumococcal conjugate vaccine 62 corticosteroid therapy 62 octreotide LAR 62 antibiotic vancomycin 62 Pentacel 62 LHRH agonist 62 Gleevec resistant 62 DOXIL 62 macrolide antibiotics 62 Plaquenil 62 posaconazole 62 Risperidone 62 Benazepril 62 SinoFresh TM 62 Isoniazid 62 rilpivirine 62 immune modulatory 62 sulphadoxine pyrimethamine 62 echinocandins 62 Coadministration 62 Camptosar ® 62 #.#mg dose 62 mecasermin 62 AZILECT 62 Zemplar 62 golimumab CNTO 62 administered concomitantly 62 RFF Pen 62 gets USFDA nod 62 tuberculin 62 ISENTRESS 62 Twinrix 62 Oxaliplatin 62 cycloserine 62 gabapentin Neurontin 62 AMEVIVE 62 tricyclic antidepressant 62 trivalent influenza vaccine 62 PROCRIT ® 62 antiandrogen 62 Tasigna nilotinib 62 rhGH 62 KAPIDEX 62 Rhinocort 62 budesonide pMDI 62 rizatriptan 62 conjugated estrogen 62 PREVENAR 62 ofloxacin 62 Known generically 62 Maribavir 62 ACIPHEX 62 methylnaltrexone bromide 62 Parathyroid Hormone 62 Zelapar 62 ROTARIX 62 valacyclovir Valtrex 62 emtricitabine tenofovir 62 benzimidazole 62 rehydration therapy 62 corticosteroid dexamethasone 62 nicardipine 62 pantoprazole 62 Stavudine 62 HCl Injection 62 clarithromycin 62 sulfadoxine pyrimethamine SP 62 Levaquin levofloxacin 62 Alphagan P 62 azelaic acid 62 Transfersome ® gel 62 bicalutamide 62 CAELYX 62 calcipotriene 62 recombinant hepatitis B 62 antiparasitic 62 Mitomycin C 62 Vaxigrip 62 TDF FTC 62 oral transmucosal 62 Methicillin 62 pyridostigmine 62 REYATAZ ® 62 Famotidine 62 metronidazole gel 62 Clevudine 62 Effexor venlafaxine 62 metered dose inhaler MDI 62 Inovelon 62 acellular pertussis vaccine 62 Axid 62 dalteparin 62 Kinoid 62 Tamsulosin 62 Bupropion 62 nucleoside analogues 62 latanoprost 62 ritonavir boosted lopinavir 62 antiandrogens 62 Suprax 62 TEMODAL 62 Conjugate Vaccine 62 #mg #mg #mg [003] 62 Betaferon R 62 Miltefosine 62 Pazopanib 62 Navelbine ® 62 Nestorone ® 62 glyburide 62 ACE Inhibitors 62 idarubicin 62 ROTATEQ 62 potent CYP#A# inhibitors 62 alendronate Fosamax 62 balsalazide 62 PENNSAID 62 Orally Disintegrating Tablets 62 Zocor simvastatin 62 Amnesteem 62 PDE4 inhibitor 62 Pegasys ® 62 ethinyl estradiol tablets 62 Serevent salmeterol 62 vapreotide acetate 62 chlamydial 62 Erythromycin 62 MMRV vaccine 62 CERVARIX 62 Depakene 62 LEXIVA r 62 oral antidiabetic drugs 62 Lamictal ODT 62 carbapenem 62 zidovudine lamivudine 62 Cefprozil 62 alpha interferon 62 Heparins 62 EMSAM 62 Xibrom TM 62 strontium ranelate 62 Glycopyrrolate 62 peginterferon alfa 62 imipramine Tofranil 62 repaglinide 62 NSAID diclofenac 62 terazosin 62 NovoRapid 62 Roche Pegasys 62 Wellmune WGP 62 pioglitazone Actos 62 LAB CGRP 62 hydrochlorothiazide HCTZ 62 Oral Spray 62 Zavesca R 62 DEXILANT 62 Elitek 62 oxycodone acetaminophen 62 Valproic acid 62 azoles 62 pravastatin Pravachol 62 Spironolactone 62 Tenofovir DF 62 tenofovir disoproxil fumarate 62 QVAR ® 62 ximelagatran 62 bolus dose 62 Prandin ® 62 angiotensin converting enzyme inhibitors 62 ADP receptor antagonist 62 immune globulins 62 PEGASYS ® 62 Natroba 62 Lauriad ® 62 ChronVac C R 62 rFVIIa 62 INVEGA R 62 Taclonex R 62 somatostatin analogue 62 Fansidar 62 replicon 62 Asclera 62 DORIBAX 62 Augmentin ES 62 topical formulations 62 Colchicine 62 eflornithine 62 betamethasone dipropionate #.# 62 oral renin inhibitor 62 conserved antigens NP 62 BARACLUDE ® 62 Menjugate 62 raltegravir 62 Antitumor 62 Boostrix 62 oral prednisolone 62 Acetaminophen Tylenol 62 Roche Xeloda 62 HepaGam B TM 61 intramuscular injections 61 etravirine 61 daily subcutaneous injections 61 NovoLog ® Mix 61 Viracept nelfinavir 61 Theophylline 61 AstraZeneca Toprol XL 61 vaccine TIV 61 beclomethasone 61 methylene blue 61 Prophylaxis 61 Neulasta ® 61 itraconazole 61 VAPRISOL 61 desloratadine 61 Raptiva ® 61 deferoxamine 61 atazanavir ritonavir 61 Desferal 61 pentamidine 61 quinidine 61 injectable antibiotic 61 rhBMP 2 61 tinzaparin 61 labetalol 61 nasal antihistamine 61 G CSFs 61 BARACLUDE R 61 Emend 61 Torisel 61 Tetanus Toxoids 61 IOP lowering 61 topical steroid 61 sublingual immunotherapy 61 boosted protease inhibitor 61 ano genital warts 61 Topical Cream 61 lansoprazole Prevacid 61 dose Iluvien 61 letrozole Femara 61 VISICOL R 61 shingles herpes zoster 61 moxidectin 61 Truvada emtricitabine 61 ActHIB vaccine 61 Cefuroxime 61 Paxil paroxetine 61 HFA MDI 61 acetaminophen ibuprofen 61 ranitidine 61 Zanamivir 61 norgestimate 61 EPIVIR 61 nucleoside analogue 61 tenofovir disoproxil fumarate Viread 61 amoxicillin penicillin