Drug Half Life Calculator
If you are also tracking your calories or daily nutrition, you may be interested in this helpful Macro Calculator which can show your optimal intake based on factors such as age, weight, height, and gender.
Drug Half Life Table
In the context of drugs, half life refers to the amount of time it takes for the body to process half of a drug dose. In other words, each half life period divides the remaining drug amount by 2.
For example, 100 mg of a drug with a half life of 1 hour would progress as: 0 hours = 100 mg, 1 hour = 50 mg [100 / 2], 2 hours = 25 mg [50 / 2], 3 hours = 12.5 mg [25 / 2], etc. until all traces of the drug have been metabolized.
If your drug is not listed above please contact us so that we can add it. Half life data has been sourced from our various drug detail pages (content from Wikipedia) and cross checked against:
[1] DailyMed
[2] Wikipedia - List of Benzodiazepines
[3] Wikipedia - Equianalgesic
[4] Quest Diagnostics - Drug Half-Life, Steady State, and Recommended Sample Collection Time
[5] MentalMeds.org - Drug Information Tables
For example, 100 mg of a drug with a half life of 1 hour would progress as: 0 hours = 100 mg, 1 hour = 50 mg [100 / 2], 2 hours = 25 mg [50 / 2], 3 hours = 12.5 mg [25 / 2], etc. until all traces of the drug have been metabolized.
| Drug | Average | Est. Range |
| Abilify (* Aripiprazole) | 4 days  | 96 hrs |
| Acebutolol | 3.5 hrs | 3 - 4 hrs |
| Acetaminophen | 2.5 hrs | 1 - 4 hrs |
| Acetylcysteine | 5.5 hrs | 5 - 6 hrs |
| Acyclovir | 2.5 hrs | 2 - 3 hrs |
| Adderall (* Amphetamine Salts) | 20.5 hrs | 7 - 34 hrs |
| Adinazolam | 3 hrs | 3 hrs |
| Alprazolam | 15 hrs | 10 - 20 hrs |
| Alprostadil | 5 mins | 5 mins |
| Amantadine | 30 hrs | 20 - 40 hrs |
| Ambien (* Zolpidem) | 2.5 hrs | 2 - 3 hrs |
| Amfepramone | 5 hrs | 4 - 6 hrs |
| Amikacin | 2.5 hrs | 2 - 3 hrs |
| Amineptine | 2.5 hrs | 2.5 hrs |
| Amiodarone | 66.5 days | 26 - 107 days |
| Amisulpride | 12 hrs | 12 hrs |
| Amitriptyline | 29.5 hrs | 8 - 51 hrs |
| Amlodipine | 40 hrs | 30 - 50 hrs |
| Amoxapine | 24 hrs | 24 hrs |
| Amoxicillin | 1.5 hrs | 1 - 2 hrs |
| Amphetamine | 12 hrs | 10 - 14 hrs |
| Amphetamine Salts | 20.5 hrs | 7 - 34 hrs |
| Amphotericin | 15 days | 15 days |
| Amprenavir | 9 hrs | 7 - 11 hrs |
| Anafranil (* Clomipramine) | 3 days | 72 hrs |
| Anidulafungin | 45 hrs | 40 - 50 hrs |
| Apomorphine | 45 mins | 30 - 60 mins |
| Argatroban | 45 mins | 39 - 51 mins |
| Aripiprazole | 4 days | 96 hrs |
| Asendin (* Amoxapine) | 24 hrs | 24 hrs |
| Aspirin | 6 hrs | 3 - 9 hrs |
| Ativan (* Lorazepam) | 15 hrs | 10 - 20 hrs |
| Atomoxetine | 5 hrs | 5 hrs |
| Atorvastatin | 14 hrs | 14 hrs |
| Azilect (* Rasagiline) | 3 hrs | 3 hrs |
| Azithromycin | 2.8 days | 68 hrs |
| Aztreonam | 1.5 hrs | 1 - 2 hrs |
| Baclofen | 3 hrs | 2 - 4 hrs |
| Benadryl (* Diphenhydramine) | 12 hrs | 12 hrs |
| Bentazepam | 3 hrs | 2 - 4 hrs |
| Betamethasone | 45 hrs | 36 - 54 hrs |
| Bethanechol | 30 mins | 30 mins |
| Bismuth | 46.5 days | 21 - 72 days |
| Bretazenil | 2.5 hrs | 2.5 hrs |
| Bromazepam | 30 hrs | 20 - 40 hrs |
| Bromocriptine | 24 hrs | 24 hrs |
| Brotizolam | 4.5 hrs | 4 - 5 hrs |
| Buprenorphine | 45 hrs | 20 - 70 hrs |
| Bupropion | 21 hrs | 12 - 30 hrs |
| BuSpar (* Buspirone) | 2.5 hrs | 2 - 3 hrs |
| Buspirone | 2.5 hrs | 2 - 3 hrs |
| Butalbital | 35 hrs | 35 hrs |
| Cabergoline | 3 days | 72 hrs |
| Caffeine | 7.5 hrs | 3 - 12 hrs |
| Camazepam | 17.5 hrs | 6 - 29 hrs |
| Capreomycin | 12 hrs | 12 hrs |
| Carbamazepine | 30.5 hrs | 14 - 47 hrs |
| Cardizem (* Diltiazem) | 3.75 hrs | 3 - 4.5 hrs |
| Carfentanil | 8 hrs | 8 hrs |
| Carisoprodol | 2 hrs | 1 - 3 hrs |
| Carvedilol | 8.5 hrs | 7 - 10 hrs |
| Caspofungin | 10 hrs | 9 - 11 hrs |
| Cefuroxime | 1.5 hrs | 1 - 2 hrs |
| Celexa (* Citalopram) | 35 hrs | 35 hrs |
| Cephalexin | 1 hour | 1 hour |
| Cetirizine | 8 hrs | 8 hrs |
| Chlordiazepoxide | 17.5 hrs | 5 - 30 hrs |
| Chlorpheniramine | 24 hrs | 21 - 27 hrs |
| Chlorpromazine | 30 hrs | 30 hrs |
| Chlorprothixene | 10 hrs | 8 - 12 hrs |
| Chlorzoxazone | 1 hour | 1 hour |
| Cialis (* Tadalafil) | 17.5 hrs | 17.5 hrs |
| Cinazepam | 60 hrs | 60 hrs |
| Cinolazepam | 9 hrs | 9 hrs |
| Ciprofloxacin | 4 hrs | 4 hrs |
| Citalopram | 35 hrs | 35 hrs |
| Clarithromycin | 3.5 hrs | 3 - 4 hrs |
| Clindamycin | 3 hrs | 2 - 4 hrs |
| Clobazam | 34 hrs | 8 - 60 hrs |
| Clobenzorex (* Amphetamine Metabolites) | 12 hrs | 10 - 14 hrs |
| Clomipramine | 3 days | 72 hrs |
| Clonazepam | 39.5 hrs | 19 - 60 hrs |
| Clonazolam | 14 hrs | 10 - 18 hrs |
| Clonidine | 14 hrs | 12 - 16 hrs |
| Clorazepate Dipotassium | 2 days | 48 hrs |
| Clotiazepam | 4 hrs | 4 hrs |
| Clotrimazole | 2 hrs | 2 hrs |
| Cloxazolam | 3.8 days | 80 - 105 hrs |
| Clozapine | 35 hrs | 4 - 66 hrs |
| Clozaril (* Clozapine) | 35 hrs | 4 - 66 hrs |
| Cocaine | 1 hour | 1 hour |
| Codeine | 3 hrs | 3 hrs |
| Compazine (* Prochlorperazine) | 5 hrs | 4 - 8 hrs |
| Cyclobenzaprine | 22.5 hrs | 8 - 37 hrs |
| Cycloserine | 12 hrs | 12 hrs |
| Cyclosporine | 16.5 hrs | 6 - 27 hrs |
| Cylert (* Pemoline) | 12 hrs | 12 hrs |
| Cymbalta (* Duloxetine) | 12 hrs | 12 hrs |
| Cyproheptadine | 8.5 hrs | 8 - 9 hrs |
| Dapoxetine | 1.5 hrs | 1.5 hrs |
| Darvocet (* Nordextropropoxyphene Metabolite) | 33 hrs | 30 - 36 hrs |
| Delavirdine | 6.5 hrs | 2 - 11 hrs |
| Delorazepam | 3.8 days | 80 - 105 hrs |
| Depacon (* Sodium Valproate) | 12.5 hrs | 9 - 16 hrs |
| Depakene (* Valproic Acid) | 12.5 hrs | 9 - 16 hrs |
| Depakote (* Divalproex Sodium) | 12.5 hrs | 9 - 16 hrs |
| Depixol | 35 hrs | 35 hrs |
| Desipramine | 33 hrs | 12 - 54 hrs |
| Desvenlafaxine | 11 hrs | 10 - 13 hrs |
| Desyrel (* Trazodone) | 8.5 hrs | 7 - 10 hrs |
| Dexamethasone | 3 hrs | 3 hrs |
| Dexbrompheniramine | 25 hrs | 25 hrs |
| Dexedrine (* Dextroamphetamine) | 10 hrs | 9 - 11 hrs |
| Dextroamphetamine | 10 hrs | 9 - 11 hrs |
| Dextromethorphan | 3 hrs | 2 - 4 hrs |
| Diamorphine | 4 mins | 2 - 6 mins |
| Diazepam | 39.5 hrs | 32 - 47 hrs |
| Dicloxacillin | 42 mins | 42 mins |
| Dicyclomine | 3.5 hrs | 2 - 5 hrs |
| Diethylpropion | 5 hrs | 4 - 6 hrs |
| Diflunisal | 10 hrs | 8 - 12 hrs |
| Digitoxin | 7 days | 4 - 10 days |
| Digoxin | 42 hrs | 36 - 48 hrs |
| Dihydrocodeine | 4 hrs | 4 hrs |
| Dilaudid (* Hydromorphone) | 2.5 hrs | 2 - 3 hrs |
| Diltiazem | 3.75 hrs | 3 - 4.5 hrs |
| Diphenhydramine | 12 hrs | 12 hrs |
| Disopyramide | 7 hrs | 4 - 10 hrs |
| Divalproex Sodium | 12.5 hrs | 9 - 16 hrs |
| DMT | 15 mins | 15 mins |
| Dostinex (* Cabergoline) | 3 days | 72 hrs |
| Dosulepin | 29.5 hrs | 14 - 45 hrs |
| Doxepin | 16.5 hrs | 8 - 25 hrs |
| Doxycycline | 20 hrs | 18 - 22 hrs |
| Droperidol | 2 hrs | 2 hrs |
| Duloxetine | 12 hrs | 12 hrs |
| Efavirenz | 47.5 hrs | 40 - 55 hrs |
| Effexor (* Venlafaxine) | 11 hrs | 9 - 13 hrs |
| Elavil (* Amitriptyline) | 29.5 hrs | 8 - 51 hrs |
| Eldepryl (* Selegiline Oral) | 10 hrs | 10 hrs |
| Emsam (* Selegiline Patch) | 21.5 hrs | 18 - 25 hrs |
| Ephedrine | 4.5 hrs | 3 - 6 hrs |
| Escitalopram | 29.5 hrs | 27 - 32 hrs |
| Estazolam | 20.5 hrs | 10 - 31 hrs |
| Eszopiclone | 6 hrs | 6 hrs |
| Ethambutol | 24 hrs | 24 hrs |
| Ethosuximide | 2.3 days | 50 - 60 hrs |
| Ethyl Carfluzepate | 17.5 hrs | 11 - 24 hrs |
| Ethyl Loflazepate | 4 days | 73 - 119 hrs |
| Etizolam | 6 hrs | 6 hrs |
| Etoricoxib | 22 hrs | 22 hrs |
| Everolimus | 32 hrs | 26 - 38 hrs |
| Felbamate | 17 hrs | 11 - 23 hrs |
| Fentanyl | 7.5 hrs | 3 - 12 hrs |
| Flecainide | 19.5 hrs | 12 - 27 hrs |
| Flubromazepam | 6.7 days | 100 - 220 hrs |
| Fluconazole | 35 hrs | 20 - 50 hrs |
| Flucytosine (* 5FC) | 4 hrs | 3 - 5 hrs |
| Flumazenil | 1 hour | 40 - 80 mins |
| Flunitrazepam | 22 hrs | 18 - 26 hrs |
| Fluoxetine | 5 days | 4 - 6 days |
| Flupenthixol | 35 hrs | 35 hrs |
| Fluphenazine Decanoate | 8.5 days | 7 - 10 days |
| Flurazepam | 6 days | 40 - 250 hrs |
| Flutazolam | 3.5 hrs | 3.5 hrs |
| Flutoprazepam | 75 hrs | 60 - 90 hrs |
| Fluvoxamine | 12.5 hrs | 12 - 13 hrs |
| Fondaparinux | 19 hrs | 17 - 21 hrs |
| Gabapentin | 6 hrs | 5 - 7 hrs |
| Gabitril (* Tiagabine) | 6.5 hrs | 5 - 8 hrs |
| Ganciclovir | 4.5 hrs | 3 - 6 hrs |
| Gentamicin | 2 hrs | 1 - 3 hrs |
| Geodon (* Ziprasidone) | 7 hrs | 7 hrs |
| Halazepam | 2.7 days | 30 - 100 hrs |
| Halcion (* Triazolam) | 3.5 hrs | 1.5 - 5.5 hrs |
| Haldol (* Haloperidol) | 27.5 hrs | 14 - 41 hrs |
| Haloperidol Decanoate | 21 days | 21 days |
| Heparin | 4.5 hrs | 3 - 6 hrs |
| Heroin | 4 hrs | 1 - 7 hrs |
| Hydrocodone | 5 hrs | 4 - 6 hrs |
| Hydromorphone | 2.5 hrs | 2 - 3 hrs |
| Hydroxychloroquine | 50 days | 1 - 2 mos |
| Hydroxyzine | 22 hrs | 20 - 24 hrs |
| Ibuprofen | 2 hrs | 1 - 3 hrs |
| Imipramine | 13 hrs | 6 - 20 hrs |
| Inapsine (* Droperidol) | 2 hrs | 2 hrs |
| Indinavir | 2 hrs | 1 - 3 hrs |
| Indomethacin | 7.5 hrs | 3 - 12 hrs |
| Invega (* Paliperidone) | 1 day | 23 hrs |
| Isoniazid | 1.5 hrs | 1 - 2 hrs |
| Itraconazole | 16 hrs | 14 - 18 hrs |
| Ketazolam | 2.7 days | 30 - 100 hrs |
| Ketoconazole | 5 hrs | 2 - 8 hrs |
| Klonopin (* Clonazepam) | 39.5 hrs | 19 - 60 hrs |
| Lacosamide | 13 hrs | 13 hrs |
| Lamictal (* Lamotrigine) | 22.5 hrs | 15 - 30 hrs |
| Lamotrigine | 22.5 hrs | 15 - 30 hrs |
| Leflunomide | 16 days | 14 - 18 days |
| Levetiracetam | 7 hrs | 6 - 8 hrs |
| Levitra (* Vardenafil) | 4.5 hrs | 4 - 5 hrs |
| Levocetirizine | 8 hrs | 6 - 10 hrs |
| Levofloxacin | 7 hrs | 6 - 8 hrs |
| Levorphanol | 13.5 hrs | 11 - 16 hrs |
| Levothyroxine | 6.5 days | 3 - 10 days |
| Lexapro (* Escitalopram) | 29.5 hrs | 27 - 32 hrs |
| Librium | 17.5 hrs | 5 - 30 hrs |
| Lidocaine | 1.5 hrs | 1 - 2 hrs |
| Lipitor (* Atorvastatin) | 14 hrs | 14 hrs |
| Lisdexamfetamine | 10 hrs | 9 - 11 hrs |
| Lisinopril | 12 hrs | 12 hrs |
| Lithium | 22 hrs | 14 - 30 hrs |
| Loperamide | 11.5 hrs | 9 - 14 hrs |
| Lopinavir + Ritonavir | 5 hrs | 4 - 6 hrs |
| Loprazolam | 9 hrs | 6 - 12 hrs |
| Lorazepam | 15 hrs | 10 - 20 hrs |
| Lormetazepam | 11 hrs | 10 - 12 hrs |
| Lortab (* Hydrocodone) | 5 hrs | 4 - 6 hrs |
| Losartan | 2 hrs | 2 hrs |
| Loxapine | 6 hrs | 4 - 8 hrs |
| LSD | 4 hrs | 3 - 5 hrs |
| Ludiomil (* Maprotiline) | 3 days | 36 - 105 hrs |
| Lupron (* Leuprorelin) | 3 hrs | 3 hrs |
| Luvox (* Fluvoxamine) | 12.5 hrs | 12 - 13 hrs |
| Lyrica (* Pregabalin) | 6.3 hrs | 6.3 hrs |
| Manerix | 1.5 hrs | 1 - 2 hrs |
| Maprotiline | 3 days | 36 - 105 hrs |
| MDMA | 6 hrs | 4 - 8 hrs |
| Medazepam | 5 days | 36 - 200 hrs |
| Melatonin | 42.5 mins | 35 - 50 mins |
| Meloxicam | 20 hrs | 20 hrs |
| Meperidine | 3.5 hrs | 2 - 5 hrs |
| Mephobarbital | 2 days | 48 - 52 hrs |
| Meprobamate | 11.5 hrs | 6 - 17 hrs |
| Mesoridazine | 1.5 days | 24 - 48 hrs |
| Metformin | 6.5 hrs | 4 - 9 hrs |
| Methadone | 37.5 hrs | 15 - 60 hrs |
| Methamphetamine | 17.5 hrs | 5 - 30 hrs |
| Methocarbamol | 1.5 hrs | 1 - 2 hrs |
| Methotrexate | 6.5 hrs | 3 - 10 hrs |
| Methylphenidate | 3.5 hrs | 2 - 5 hrs |
| Metoprolol | 5 hrs | 3 - 7 hrs |
| Metronidazole | 8 hrs | 8 hrs |
| Midazolam | 2 hrs | 90 - 150 mins |
| Milnacipran | 8 hrs | 8 hrs |
| Minocycline | 18.5 hrs | 12 - 25 hrs |
| Mirapex (* Pramipexole) | 10 hrs | 8 - 12 hrs |
| Mirtazapine | 30 hrs | 20 - 40 hrs |
| Moclobemide | 1.5 hrs | 1 - 2 hrs |
| Modafinil | 15 hrs | 15 hrs |
| Molindone | 1.5 hrs | 90 mins |
| Morphine | 4 hrs | 1 - 7 hrs |
| Muse (* Alprostadil) | 5 mins | 5 mins |
| Mycophenolic Acid | 13 hrs | 8 - 18 hrs |
| Naloxone | 1.5 hrs | 1.5 hrs |
| Naltrexone (Metabolite 6?-naltrexol) | 13 hrs | 13 hrs |
| Naproxen | 18 hrs | 12 - 24 hrs |
| Navane (* Thiothixene) | 15 hrs | 10 - 20 hrs |
| Nefazodone | 3 hrs | 2 - 4 hrs |
| Nelfinavir | 4.5 hrs | 4 - 5 hrs |
| Neostigmine | 1 hour | 50 - 90 mins |
| Neurontin (* Gabapentin) | 6 hrs | 5 - 7 hrs |
| Nevirapine | 27.5 hrs | 25 - 30 hrs |
| Nimesulide | 3.5 hrs | 2 - 5 hrs |
| Nimetazepam | 22 hrs | 14 - 30 hrs |
| Nitrazepam | 32.5 hrs | 17 - 48 hrs |
| Nordiazepam | 5 days | 36 - 200 hrs |
| Norpramin (* Desipramine) | 33 hrs | 12 - 54 hrs |
| Nortriptyline | 53 hrs | 16 - 90 hrs |
| Nucynta (* Tapentadol) | 4 hrs | 4 hrs |
| Ofloxacin | 8.5 hrs | 8 - 9 hrs |
| Olanzapine | 37.5 hrs | 21 - 54 hrs |
| Omeprazole | 1 hour | 1 hour |
| Ondansetron | 5.7 hrs | 5.7 hrs |
| Opana (* Oxymorphone) | 8 hrs | 7 - 9 hrs |
| Oxazepam | 7.5 hrs | 4 - 11 hrs |
| Oxcarbazepine | 3 hrs | 1 - 5 hrs |
| Oxycodone | 4 hrs | 3 - 5 hrs |
| OxyContin (* Oxycodone) | 4 hrs | 3 - 5 hrs |
| Oxymorphone | 8 hrs | 7 - 9 hrs |
| Paliperidone | 1 day | 23 hrs |
| Pamelor (* Nortriptyline) | 53 hrs | 16 - 90 hrs |
| Pantoprazole | 1.5 hrs | 1 -2 hrs |
| Parlodel (* Bromocriptine) | 24 hrs | 24 hrs |
| Parnate (* Tranylcypromine) | 2.5 hrs | 2 - 3 hrs |
| Paroxetine | 21 hrs | 21 hrs |
| Paxil (* Paroxetine) | 21 hrs | 21 hrs |
| Pemoline | 12 hrs | 12 hrs |
| Penicillin (Dose-dependent) | 28 hrs | 30 mins - 56 hrs |
| Pentazocine | 3.6 hrs | 1.5 - 10 hrs |
| Pentobarbital | 31.5 hrs | 15 - 48 hrs |
| Percocet (* Oxycodone) | 4 hrs | 3 - 5 hrs |
| Pergolide | 27 hrs | 27 hrs |
| Periactin (* Cyproheptadine) | 8.5 hrs | 8 - 9 hrs |
| Perphenazine | 14 hrs | 8 - 20 hrs |
| Pethidine | 3.5 hrs | 2 - 5 hrs |
| Phenazepam | 2.5 days | 60 hrs |
| Phendimetrazine | 21.5 hrs | 19 - 24 hrs |
| Phenelzine | 12 hrs | 12 hrs |
| Phenobarbital | 4 days | 81 - 117 hrs |
| Phentermine | 25 hrs | 25 hrs |
| Phenylephrine | 3 hrs | 2.5 - 3.5 hrs |
| Phenytoin | 20 hrs | 18 - 22 hrs |
| Pimozide | 2.3 days | 55 hrs |
| Pinazepam | 3 days | 40 - 100 hrs |
| Piribedil | 4.2 hrs | 1.7 - 6.7 hrs |
| Posaconazole | 34.5 hrs | 32 - 37 hrs |
| Pramipexole | 10 hrs | 8 - 12 hrs |
| Prazepam | 5 days | 36 - 200 hrs |
| Prednisone | 27 hrs | 18 - 36 hrs |
| Pregabalin | 6.3 hrs | 6.3 hrs |
| Premazepam | 11.5 hrs | 10 - 13 hrs |
| Primidone | 5 hrs | 3 - 7 hrs |
| Pristiq (* Desvenlafaxine) | 11 hrs | 10 - 13 hrs |
| Procainamide | 3.5 hrs | 2 - 5 hrs |
| Prochlorperazine | 5 hrs | 4 - 8 hrs |
| Prolixin Injection | 15 hrs | 15 hrs |
| Promazine | 6 hrs | 6 hrs |
| Promethazine | 17.5 hrs | 16 - 19 hrs |
| Propafenone | 6 hrs | 2 - 10 hrs |
| Propoxyphene (Nordextropropoxyphene) | 33 hrs | 30 - 36 hrs |
| Propranolol | 4 hrs | 2 - 6 hrs |
| Prostigmin (* Neostigmine) | 1 hour | 50 - 90 mins |
| Protriptyline | 3 days | 54 - 92 hrs |
| Provigil (* Modafinil) | 15 hrs | 15 hrs |
| Prozac (* Fluoxetine) | 5 days | 4 - 6 days |
| Pseudoephedrine | 6 hrs | 4 - 8 hrs |
| Psilocybin | 2.7 hrs | 100 - 220 mins |
| Pyrazinamide | 9.5 hrs | 9 - 10 hrs |
| Pyrazolam | 17 hrs | 16 - 18 hrs |
| Quazepam | 79.5 hrs | 39 - 120 hrs |
| Quetiapine (Norquetiapine Metabolite) | 7 hrs | 7 hrs |
| Quinidine | 7 hrs | 5 - 9 hrs |
| Rabeprazole | 1.5 hrs | 1.5 hrs |
| Ranexa (* Ranolazine) | 1.65 hrs | 1.4 - 1.9 hrs |
| Ranitidine | 2.5 hrs | 2 - 3 hrs |
| Ranolazine | 1.65 hrs | 1.4 - 1.9 hrs |
| Rasagiline | 3 hrs | 3 hrs |
| Reboxetine | 12 hrs | 12 hrs |
| Remeron (* Mirtazapine) | 30 hrs | 20 - 40 hrs |
| Requip (* Ropinirole) | 5.5 hrs | 5 - 6 hrs |
| Rifabutin | 42.5 hrs | 16 - 69 hrs |
| Rifampin | 2.5 hrs | 2 - 3 hrs |
| Rilmazafone | 10.5 hrs | 10-11 hrs |
| Risperdal (* Risperidone) | 20 hrs | 20 hrs |
| Risperidone (Injection) | 4.5 days | 3 - 6 days |
| Risperidone (Oral) | 20 hrs | 20 hrs |
| Ritalin (* Methylphenidate) | 3.5 hrs | 2 - 5 hrs |
| Ritonavir | 4 hrs | 3 - 5 hrs |
| Rivaroxaban | 7 hrs | 5 - 9 hrs |
| Ropinirole | 5.5 hrs | 5 - 6 hrs |
| Roxicodone (* Oxycodone) | 4 hrs | 3 - 5 hrs |
| S-Adenosyl Methionine | 1.6 hrs | 100 mins |
| Salicylate | 2.5 hrs | 2 - 3 hrs |
| SAM-e (* S-Adenosyl Methionine) | 1.6 hrs | 100 mins |
| Saquinavir | 12 hrs | 9 - 15 hrs |
| Savella (* Milnacipran) | 8 hrs | 8 hrs |
| Secobarbital | 25.5 hrs | 22 - 29 hrs |
| Selegiline (Oral) | 10 hrs | 10 hrs |
| Selegiline (Patch) | 21.5 hrs | 18 - 25 hrs |
| Seroquel (* Quetiapine) | 7 hrs | 7 hrs |
| Sertindole | 3 days | 3 days |
| Sertraline | 29 hrs | 13 - 45 hrs |
| Serzone (* Nefazodone) | 3 hrs | 2 - 4 hrs |
| Sibutramine (Active Metabolites 1 & 2) | 15 hrs | 14 - 16 hrs |
| Sildenafil | 3.5 hrs | 3 - 4 hrs |
| Sinequan | 16.5 hrs | 8 - 25 hrs |
| Sirolimus (Rapamycin) | 2.6 days | 46 - 78 hrs |
| Sodium Valproate | 12.5 hrs | 9 - 16 hrs |
| Solian | 12 hrs | 12 hrs |
| Soma (* Carisoprodol) | 2 hrs | 1 - 3 hrs |
| Sonata (* Zaleplon) | 75 mins | 60 - 90 mins |
| Stablon | 3 hrs | 3 hrs |
| Stelazine (* Trifluoperazine) | 15 hrs | 10 - 20 hrs |
| Strattera (* Atomoxetine) | 5 hrs | 5 hrs |
| Streptomycin | 5.5 hrs | 5 - 6 hrs |
| Suboxone (* Buprenorphine) | 45 hrs | 20 - 70 hrs |
| Subutex | 45 hrs | 20 - 70 hrs |
| Sufentanil | 4.4 hrs | 4.4 hrs |
| Sulfamethoxazole | 10 hrs | 10 hrs |
| Sulfasalazine | 7.5 hrs | 5 - 10 hrs |
| Sulpiride | 7 hrs | 6 - 8 hrs |
| Survector | 2.5 hrs | 2.5 hrs |
| Symbyax (* Fluoxetine) | 5 days | 4 - 6 days |
| Symmetrel (* Amantadine) | 30 hrs | 20 - 40 hrs |
| Tacrolimus (FK-506) | 19.5 hrs | 4 - 35 hrs |
| Tadalafil | 17.5 hrs | 17.5 hrs |
| Talwin (* Pentazocine) | 3.6 hrs | 1.5 - 10 hrs |
| Talwin NX (* Pentazocine + Naloxone) | 3.6 hrs | 1.5 - 10 hrs |
| Tapentadol | 4 hrs | 4 hrs |
| Tegretol | 30.5 hrs | 14 - 47 hrs |
| Telmisartan | 24 hrs | 24 hrs |
| Temazepam | 14 hrs | 8 - 20 hrs |
| Tetracycline | 9 hrs | 7 - 11 hrs |
| Tenuate (* Diethylpropion) | 5 hrs | 4 - 6 hrs |
| Tetrazepam | 14.5 hrs | 3 - 26 hrs |
| Theophylline | 9 hrs | 7 - 11 hrs |
| THC | 30.3 hrs | 1.6 - 59 hrs |
| Thienalprazolam | 25 hrs | 10 - 40 hrs |
| Thioridazine | 22.5 hrs | 21 - 24 hrs |
| Thiothixene | 15 hrs | 10 - 20 hrs |
| Thorazine | 30 hrs | 30 hrs |
| Tiagabine | 6.5 hrs | 5 - 8 hrs |
| Tianeptine | 3 hrs | 3 hrs |
| Tizanidine | 2.5 hrs | 2.5 hrs |
| Tobramycin | 2 hrs | 2 hrs |
| Tofranil (* Imipramine) | 13 hrs | 6 - 20 hrs |
| Topamax (* Topiramate) | 22 hrs | 19 - 25 hrs |
| Topiramate | 22 hrs | 19 - 25 hrs |
| Tramadol | 7 hrs | 6 - 8 hrs |
| Tranxene (* Clorazepate Dipotassium) | 2 days | 48 hrs |
| Tranylcypromine | 2.5 hrs | 2 - 3 hrs |
| Trazodone | 8.5 hrs | 7 - 10 hrs |
| Triazolam | 3.5 hrs | 1.5 - 5.5 hrs |
| Trifluoperazine | 15 hrs | 10 - 20 hrs |
| Trilafon (* Perphenazine) | 14 hrs | 8 - 20 hrs |
| Trileptal (* Oxcarbazepine) | 3 hrs | 1 - 5 hrs |
| Trimethoprim | 10 hrs | 8 - 12 hrs |
| Trimipramine | 27.5 hrs | 16 - 39 hrs |
| Surmontil (* Trimipramine) | 27.5 hrs | 16 - 39 hrs |
| Truxal | 10 hrs | 8 - 12 hrs |
| Uprima (* Apomorphine) | 45 mins | 30 - 60 mins |
| Urecholine (* Bethanechol) | 30 mins | 30 mins |
| Valium (* Diazepam) | 39.5 hrs | 32 - 47 hrs |
| Valproic Acid | 12.5 hrs | 9 - 16 hrs |
| Vancomycin | 7.5 hrs | 4 - 11 hrs |
| Vardenafil | 4.5 hrs | 4 - 5 hrs |
| Venlafaxine | 11 hrs | 9 - 13 hrs |
| Viagra (* Sildenafil) | 3.5 hrs | 3 - 4 hrs |
| Vicodin (* Hydrocodone) | 5 hrs | 4 - 6 hrs |
| Vivactil (* Protriptyline) | 3 days | 54 - 92 hrs |
| Voriconazole (Dose-dependent) | 7.5 hrs | 6 - 9 hrs |
| Vyvanse (* Lisdexamfetamine) | 10 hrs | 9 - 11 hrs |
| Warfarin | 40 hrs | 20 - 60 hrs |
| Wellbutrin (* Bupropion) | 21 hrs | 12 - 30 hrs |
| Xanax (* Alprazolam) | 15 hrs | 10 - 20 hrs |
| Xarelto (* Rivaroxaban) | 7 hrs | 5 - 9 hrs |
| Yohimbine | 1.4 hrs | 15 - 150 mins |
| Zaleplon | 75 mins | 60 - 90 mins |
| Ziprasidone | 7 hrs | 7 hrs |
| Zofran (* Ondansetron) | 5.7 hrs | 5.7 hrs |
| Zoloft (* Sertraline) | 29 hrs | 13 - 45 hrs |
| Zolpidem | 2.5 hrs | 2 - 3 hrs |
| Zonisamide | 2.6 days | 53 - 75 hrs |
| Zopiclone | 5 hrs | 4 - 6 hrs |
| Zotepine | 15 hrs | 14 - 16 hrs |
| Zyprexa (* Olanzapine) | 37.5 hrs | 21 - 54 hrs |
If your drug is not listed above please contact us so that we can add it. Half life data has been sourced from our various drug detail pages (content from Wikipedia) and cross checked against:
[1] DailyMed
[2] Wikipedia - List of Benzodiazepines
[3] Wikipedia - Equianalgesic
[4] Quest Diagnostics - Drug Half-Life, Steady State, and Recommended Sample Collection Time
[5] MentalMeds.org - Drug Information Tables