Half Life Calculator


This calculator estimates how long it takes for a drug to leave the body. Each iteration reduces the remaining drug amount by 50% (= amount / 2) and adds the average half life period to the total elapsed time (= time + half life period).



New Calculation




Dosage Units
g = gram (1000 mg)
mg = milligram
mcg (μg) = microgram (0.001 mg)

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.

DrugAverageEst. Range
Abilify
(* Aripiprazole)
4 days 96 hrs
Acetaminophen2.5 hrs 1 - 4 hrs
Acetylcysteine5.5 hrs 5 - 6 hrs
Acyclovir2.5 hrs 2 - 3 hrs
Adderall
(* Amphetamine Salts)
20.5 hrs 7 - 34 hrs
Adinazolam3 hrs 3 hrs
Alprazolam15 hrs 10 - 20 hrs
Alprostadil5 mins 5 mins
Amantadine30 hrs 20 - 40 hrs
Ambien
(* Zolpidem)
2.5 hrs 2 - 3 hrs
Amfepramone5 hrs 4 - 6 hrs
Amikacin2.5 hrs 2 - 3 hrs
Amineptine2.5 hrs 2.5 hrs
Amiodarone66.5 days 26 - 107 days
Amisulpride12 hrs 12 hrs
Amitriptyline29.5 hrs 8 - 51 hrs
Amlodipine40 hrs 30 - 50 hrs
Amoxapine24 hrs 24 hrs
Amoxicillin1.5 hrs 1 - 2 hrs
Amphetamine12 hrs 10 - 14 hrs
Amphetamine Salts20.5 hrs 7 - 34 hrs
Amphotericin15 days 15 days
Amprenavir9 hrs 7 - 11 hrs
Anafranil
(* Clomipramine)
3 days 72 hrs
Anidulafungin45 hrs 40 - 50 hrs
Apomorphine45 mins 30 - 60 mins
Argatroban45 mins 39 - 51 mins
Aripiprazole4 days 96 hrs
Asendin
(* Amoxapine)
24 hrs 24 hrs
Aspirin6 hrs 3 - 9 hrs
Ativan
(* Lorazepam)
15 hrs 10 - 20 hrs
Atomoxetine5 hrs 5 hrs
Atorvastatin14 hrs 14 hrs
Azilect
(* Rasagiline)
3 hrs 3 hrs
Azithromycin2.8 days 68 hrs
Aztreonam1.5 hrs 1 - 2 hrs
Baclofen3 hrs 2 - 4 hrs
Benadryl
(* Diphenhydramine)
12 hrs 12 hrs
Bentazepam3 hrs 2 - 4 hrs
Betamethasone45 hrs 36 - 54 hrs
Bethanechol30 mins 30 mins
Bismuth46.5 days 21 - 72 days
Bretazenil2.5 hrs 2.5 hrs
Bromazepam30 hrs 20 - 40 hrs
Bromocriptine24 hrs 24 hrs
Brotizolam4.5 hrs 4 - 5 hrs
Buprenorphine45 hrs 20 - 70 hrs
Bupropion21 hrs 12 - 30 hrs
BuSpar
(* Buspirone)
2.5 hrs 2 - 3 hrs
Buspirone2.5 hrs 2 - 3 hrs
Butalbital35 hrs 35 hrs
Cabergoline3 days 72 hrs
Caffeine7.5 hrs 3 - 12 hrs
Camazepam17.5 hrs 6 - 29 hrs
Capreomycin12 hrs 12 hrs
Carbamazepine30.5 hrs 14 - 47 hrs
Carfentanil8 hrs 8 hrs
Carisoprodol2 hrs 1 - 3 hrs
Carvedilol8.5 hrs 7 - 10 hrs
Caspofungin10 hrs 9 - 11 hrs
Cefuroxime1.5 hrs 1 - 2 hrs
Celexa
(* Citalopram)
35 hrs 35 hrs
Cephalexin1 hour 1 hour
Cetirizine8 hrs 8 hrs
Chlordiazepoxide17.5 hrs 5 - 30 hrs
Chlorpheniramine24 hrs 21 - 27 hrs
Chlorpromazine30 hrs 30 hrs
Chlorprothixene10 hrs 8 - 12 hrs
Chlorzoxazone1 hour 1 hour
Cialis
(* Tadalafil)
17.5 hrs 17.5 hrs
Cinazepam60 hrs 60 hrs
Cinolazepam9 hrs 9 hrs
Ciprofloxacin4 hrs 4 hrs
Citalopram35 hrs 35 hrs
Clarithromycin3.5 hrs 3 - 4 hrs
Clindamycin3 hrs 2 - 4 hrs
Clobazam34 hrs 8 - 60 hrs
Clobenzorex
(* Amphetamine Metabolites)
12 hrs 10 - 14 hrs
Clomipramine3 days 72 hrs
Clonazepam39.5 hrs 19 - 60 hrs
Clonazolam14 hrs 10 - 18 hrs
Clonidine14 hrs 12 - 16 hrs
Clorazepate Dipotassium2 days 48 hrs
Clotiazepam4 hrs 4 hrs
Clotrimazole2 hrs 2 hrs
Cloxazolam3.8 days 80 - 105 hrs
Clozapine35 hrs 4 - 66 hrs
Clozaril
(* Clozapine)
35 hrs 4 - 66 hrs
Cocaine1 hour1 hour
Codeine3 hrs 3 hrs
Compazine
(* Prochlorperazine)
5 hrs 4 - 8 hrs
Cyclobenzaprine22.5 hrs 8 - 37 hrs
Cycloserine12 hrs 12 hrs
Cyclosporine16.5 hrs 6 - 27 hrs
Cylert
(* Pemoline)
12 hrs 12 hrs
Cymbalta
(* Duloxetine)
12 hrs 12 hrs
Cyproheptadine8.5 hrs 8 - 9 hrs
Dapoxetine1.5 hrs 1.5 hrs
Darvocet
(* Nordextropropoxyphene Metabolite)
33 hrs 30 - 36 hrs
Delavirdine6.5 hrs 2 - 11 hrs
Delorazepam3.8 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
(* Flupenthixol)
35 hrs 35 hrs
Desipramine33 hrs 12 - 54 hrs
Desvenlafaxine11 hrs 10 - 13 hrs
Desyrel
(* Trazodone)
8.5 hrs 7 - 10 hrs
Dexamethasone3 hrs 3 hrs
Dexbrompheniramine25 hrs 25 hrs
Dexedrine
(* Dextroamphetamine)
10 hrs 9 - 11 hrs
Dextroamphetamine10 hrs 9 - 11 hrs
Dextromethorphan3 hrs 2 - 4 hrs
Diamorphine
(IV/IM)
4 mins 2 - 6 mins
Diazepam39.5 hrs 32 - 47 hrs
Dicloxacillin42 mins 42 mins
Dicyclomine3.5 hrs 2 - 5 hrs
Diethylpropion5 hrs 4 - 6 hrs
Diflunisal10 hrs 8 - 12 hrs
Digitoxin7 days 4 - 10 days
Digoxin42 hrs 36 - 48 hrs
Dihydrocodeine4 hrs 4 hrs
Dilaudid
(* Hydromorphone)
2.5 hrs 2 - 3 hrs
Diphenhydramine12 hrs 12 hrs
Disopyramide7 hrs 4 - 10 hrs
Divalproex Sodium12.5 hrs 9 - 16 hrs
DMT
(* N,N-Dimethyltryptamine)
15 mins15 mins
Dostinex
(* Cabergoline)
3 days 72 hrs
Dosulepin29.5 hrs 14 - 45 hrs
Doxepin16.5 hrs 8 - 25 hrs
Doxycycline20 hrs 18 - 22 hrs
Droperidol2 hrs 2 hrs
Duloxetine12 hrs 12 hrs
Efavirenz47.5 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
Ephedrine4.5 hrs 3 - 6 hrs
Escitalopram29.5 hrs 27 - 32 hrs
Estazolam20.5 hrs 10 - 31 hrs
Eszopiclone6 hrs 6 hrs
Ethambutol24 hrs 24 hrs
Ethosuximide2.3 days 50 - 60 hrs
Ethyl Carfluzepate17.5 hrs 11 - 24 hrs
Ethyl Loflazepate4 days 73 - 119 hrs
Etizolam6 hrs 6 hrs
Etoricoxib22 hrs 22 hrs
Everolimus32 hrs 26 - 38 hrs
Felbamate17 hrs 11 - 23 hrs
Fentanyl7.5 hrs 3 - 12 hrs
Flecainide19.5 hrs 12 - 27 hrs
Flubromazepam6.7 days 100 - 220 hrs
Fluconazole35 hrs 20 - 50 hrs
Flucytosine
(* 5FC)
4 hrs 3 - 5 hrs
Flumazenil1 hour 40 - 80 mins
Flunitrazepam22 hrs 18 - 26 hrs
Fluoxetine5 days 4 - 6 days
Flupenthixol35 hrs 35 hrs
Fluphenazine Decanoate8.5 days 7 - 10 days
Flurazepam6 days 40 - 250 hrs
Flutazolam3.5 hrs 3.5 hrs
Flutoprazepam75 hrs 60 - 90 hrs
Fluvoxamine12.5 hrs 12 - 13 hrs
Fondaparinux19 hrs 17 - 21 hrs
Gabapentin6 hrs 5 - 7 hrs
Gabitril
(* Tiagabine)
6.5 hrs 5 - 8 hrs
Ganciclovir4.5 hrs 3 - 6 hrs
Gentamicin2 hrs 1 - 3 hrs
Geodon
(* Ziprasidone)
7 hrs 7 hrs
Halazepam2.7 days 30 - 100 hrs
Halcion
(* Triazolam)
3.5 hrs 1.5 - 5.5 hrs
Haldol
(* Haloperidol)
27.5 hrs 14 - 41 hrs
Haloperidol Decanoate21 days 21 days
Heparin4.5 hrs 3 - 6 hrs
Heroin
(* Morphine Metabolites)
4 hrs1 - 7 hrs
Hydrocodone5 hrs 4 - 6 hrs
Hydromorphone2.5 hrs 2 - 3 hrs
Hydroxychloroquine50 days 1 - 2 mos
Hydroxyzine22 hrs 20 - 24 hrs
Ibuprofen2 hrs 1 - 3 hrs
Imipramine13 hrs 6 - 20 hrs
Inapsine
(* Droperidol)
2 hrs 2 hrs
Indinavir2 hrs 1 - 3 hrs
Indomethacin7.5 hrs 3 - 12 hrs
Invega
(* Paliperidone)
1 day 23 hrs
Isoniazid1.5 hrs 1 - 2 hrs
Itraconazole16 hrs 14 - 18 hrs
Ketazolam2.7 days 30 - 100 hrs
Ketoconazole5 hrs 2 - 8 hrs
Klonopin
(* Clonazepam)
39.5 hrs 19 - 60 hrs
Lacosamide13 hrs 13 hrs
Lamictal
(* Lamotrigine)
22.5 hrs 15 - 30 hrs
Lamotrigine22.5 hrs 15 - 30 hrs
Leflunomide16 days 14 - 18 days
Levetiracetam7 hrs 6 - 8 hrs
Levitra
(* Vardenafil)
4.5 hrs 4 - 5 hrs
Levocetirizine8 hrs 6 - 10 hrs
Levofloxacin7 hrs 6 - 8 hrs
Levorphanol13.5 hrs 11 - 16 hrs
Levothyroxine6.5 days 3 - 10 days
Lexapro
(* Escitalopram)
29.5 hrs 27 - 32 hrs
Librium17.5 hrs 5 - 30 hrs
Lidocaine1.5 hrs 1 - 2 hrs
Lipitor
(* Atorvastatin)
14 hrs 14 hrs
Lisdexamfetamine10 hrs 9 - 11 hrs
Lisinopril12 hrs 12 hrs
Lithium22 hrs 14 - 30 hrs
Loperamide11.5 hrs 9 - 14 hrs
Lopinavir + Ritonavir5 hrs 4 - 6 hrs
Loprazolam9 hrs 6 - 12 hrs
Lorazepam15 hrs 10 - 20 hrs
Lormetazepam11 hrs 10 - 12 hrs
Lortab
(* Hydrocodone)
5 hrs 4 - 6 hrs
Losartan2 hrs 2 hrs
Loxapine6 hrs 4 - 8 hrs
LSD
(Lysergic acid diethylamide)
4 hrs3 - 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
(* Moclobemide)
1.5 hrs 1 - 2 hrs
Maprotiline3 days 36 - 105 hrs
MDMA
(3,4-Methylenedioxy​methamphetamine)
6 hrs4 - 8 hrs
Medazepam5 days 36 - 200 hrs
Melatonin42.5 mins 35 - 50 mins
Meloxicam20 hrs 20 hrs
Meperidine3.5 hrs 2 - 5 hrs
Mephobarbital2 days 48 - 52 hrs
Meprobamate11.5 hrs 6 - 17 hrs
Mesoridazine1.5 days 24 - 48 hrs
Metformin6.5 hrs 4 - 9 hrs
Methadone37.5 hrs 15 - 60 hrs
Methamphetamine17.5 hrs 5 - 30 hrs
Methocarbamol1.5 hrs 1 - 2 hrs
Methotrexate6.5 hrs 3 - 10 hrs
Methylphenidate3.5 hrs 2 - 5 hrs
Metoprolol5 hrs 3 - 7 hrs
Metronidazole8 hrs 8 hrs
Midazolam2 hrs 90 - 150 mins
Milnacipran8 hrs 8 hrs
Minocycline18.5 hrs 12 - 25 hrs
Mirapex
(* Pramipexole)
10 hrs 8 - 12 hrs
Mirtazapine30 hrs 20 - 40 hrs
Moclobemide1.5 hrs 1 - 2 hrs
Modafinil15 hrs 15 hrs
Molindone1.5 hrs 90 mins
Morphine4 hrs 1 - 7 hrs
Muse
(* Alprostadil)
5 mins 5 mins
Mycophenolic Acid13 hrs 8 - 18 hrs
Naloxone1.5 hrs 1.5 hrs
Naltrexone
(Metabolite 6β-naltrexol)
13 hrs 13 hrs
Naproxen18 hrs 12 - 24 hrs
Navane
(* Thiothixene)
15 hrs 10 - 20 hrs
Nefazodone3 hrs 2 - 4 hrs
Nelfinavir4.5 hrs 4 - 5 hrs
Neostigmine1 hour 50 - 90 mins
Neurontin
(* Gabapentin)
6 hrs 5 - 7 hrs
Nevirapine27.5 hrs 25 - 30 hrs
Nimesulide3.5 hrs 2 - 5 hrs
Nimetazepam22 hrs 14 - 30 hrs
Nitrazepam32.5 hrs 17 - 48 hrs
Nordiazepam5 days 36 - 200 hrs
Norpramin
(* Desipramine)
33 hrs 12 - 54 hrs
Nortriptyline53 hrs 16 - 90 hrs
Nucynta
(* Tapentadol)
4 hrs 4 hrs
Ofloxacin8.5 hrs 8 - 9 hrs
Olanzapine37.5 hrs 21 - 54 hrs
Omeprazole1 hour 1 hour
Ondansetron5.7 hrs 5.7 hrs
Opana
(* Oxymorphone)
8 hrs 7 - 9 hrs
Oxazepam7.5 hrs 4 - 11 hrs
Oxcarbazepine3 hrs 1 - 5 hrs
Oxycodone4 hrs 3 - 5 hrs
OxyContin
(* Oxycodone)
4 hrs 3 - 5 hrs
Oxymorphone8 hrs 7 - 9 hrs
Paliperidone1 day 23 hrs
Pamelor
(* Nortriptyline)
53 hrs 16 - 90 hrs
Pantoprazole1.5 hrs 1 -2 hrs
Parlodel
(* Bromocriptine)
24 hrs 24 hrs
Parnate
(* Tranylcypromine)
2.5 hrs 2 - 3 hrs
Paroxetine21 hrs 21 hrs
Paxil
(* Paroxetine)
21 hrs 21 hrs
Pemoline12 hrs 12 hrs
Penicillin
(Dose-dependent)
28 hrs 30 mins - 56 hrs
Pentobarbital31.5 hrs 15 - 48 hrs
Percocet
(* Oxycodone)
4 hrs 3 - 5 hrs
Pergolide27 hrs 27 hrs
Periactin
(* Cyproheptadine)
8.5 hrs 8 - 9 hrs
Perphenazine14 hrs 8 - 20 hrs
Pethidine3.5 hrs 2 - 5 hrs
Phenazepam2.5 days 60 hrs
Phendimetrazine21.5 hrs 19 - 24 hrs
Phenelzine12 hrs 12 hrs
Phenobarbital4 days 81 - 117 hrs
Phentermine25 hrs 25 hrs
Phenylephrine3 hrs 2.5 - 3.5 hrs
Phenytoin20 hrs 18 - 22 hrs
Pimozide2.3 days 55 hrs
Pinazepam3 days 40 - 100 hrs
Piribedil4.2 hrs 1.7 - 6.7 hrs
Posaconazole34.5 hrs 32 - 37 hrs
Pramipexole10 hrs 8 - 12 hrs
Prazepam5 days 36 - 200 hrs
Prednisone27 hrs 18 - 36 hrs
Pregabalin6.3 hrs 6.3 hrs
Premazepam11.5 hrs 10 - 13 hrs
Primidone5 hrs 3 - 7 hrs
Pristiq
(* Desvenlafaxine)
11 hrs 10 - 13 hrs
Procainamide3.5 hrs 2 - 5 hrs
Prochlorperazine5 hrs 4 - 8 hrs
Prolixin Injection15 hrs 15 hrs
Promazine6 hrs 6 hrs
Promethazine17.5 hrs 16 - 19 hrs
Propafenone6 hrs 2 - 10 hrs
Propoxyphene
(Nordextropropoxyphene)
33 hrs 30 - 36 hrs
Propranolol4 hrs 2 - 6 hrs
Prostigmin
(* Neostigmine)
1 hour 50 - 90 mins
Protriptyline3 days 54 - 92 hrs
Provigil
(* Modafinil)
15 hrs 15 hrs
Prozac
(* Fluoxetine)
5 days 4 - 6 days
Pseudoephedrine6 hrs 4 - 8 hrs
Psilocybin2.7 hrs100 - 220 mins
Pyrazinamide9.5 hrs 9 - 10 hrs
Pyrazolam17 hrs 16 - 18 hrs
Quazepam79.5 hrs 39 - 120 hrs
Quetiapine
(Norquetiapine Metabolite)
7 hrs 7 hrs
Quinidine7 hrs 5 - 9 hrs
Rabeprazole1.5 hrs 1.5 hrs
Ranitidine2.5 hrs 2 - 3 hrs
Rasagiline3 hrs 3 hrs
Reboxetine12 hrs 12 hrs
Remeron
(* Mirtazapine)
30 hrs 20 - 40 hrs
Requip
(* Ropinirole)
5.5 hrs 5 - 6 hrs
Rifabutin42.5 hrs 16 - 69 hrs
Rifampin2.5 hrs 2 - 3 hrs
Rilmazafone10.5 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
Ritonavir4 hrs 3 - 5 hrs
Rivaroxaban7 hrs 5 - 9 hrs
Ropinirole5.5 hrs 5 - 6 hrs
Roxicodone
(* Oxycodone)
4 hrs 3 - 5 hrs
S-Adenosyl Methionine1.6 hrs 100 mins
Salicylate2.5 hrs 2 - 3 hrs
SAM-e
(* S-Adenosyl Methionine)
1.6 hrs 100 mins
Saquinavir12 hrs 9 - 15 hrs
Savella
(* Milnacipran)
8 hrs 8 hrs
Secobarbital25.5 hrs 22 - 29 hrs
Selegiline
(Oral)
10 hrs 10 hrs
Selegiline
(Patch)
21.5 hrs 18 - 25 hrs
Seroquel
(* Quetiapine)
7 hrs 7 hrs
Sertindole3 days 3 days
Sertraline29 hrs 13 - 45 hrs
Serzone
(* Nefazodone)
3 hrs 2 - 4 hrs
Sibutramine
(Active Metabolites 1 & 2)
15 hrs 14 - 16 hrs
Sildenafil3.5 hrs 3 - 4 hrs
Sinequan16.5 hrs 8 - 25 hrs
Sirolimus
(Rapamycin)
2.6 days 46 - 78 hrs
Sodium Valproate12.5 hrs 9 - 16 hrs
Solian
(* Amisulpride)
12 hrs 12 hrs
Soma
(* Carisoprodol)
2 hrs 1 - 3 hrs
Sonata
(* Zaleplon)
75 mins 60 - 90 mins
Stablon
(* Tianeptine)
3 hrs 3 hrs
Stelazine
(* Trifluoperazine)
15 hrs 10 - 20 hrs
Strattera
(* Atomoxetine)
5 hrs 5 hrs
Streptomycin5.5 hrs 5 - 6 hrs
Suboxone
(* Buprenorphine)
45 hrs 20 - 70 hrs
Subutex45 hrs 20 - 70 hrs
Sufentanil4.4 hrs 4.4 hrs
Sulfamethoxazole10 hrs 10 hrs
Sulfasalazine7.5 hrs 5 - 10 hrs
Sulpiride7 hrs 6 - 8 hrs
Survector
(* Amineptine)
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
Tadalafil17.5 hrs 17.5 hrs
Tapentadol4 hrs 4 hrs
Tegretol30.5 hrs 14 - 47 hrs
Telmisartan24 hrs 24 hrs
Temazepam14 hrs 8 - 20 hrs
Tenuate
(* Diethylpropion)
5 hrs 4 - 6 hrs
Tetracycline9 hrs 7 - 11 hrs
Tetrazepam14.5 hrs 3 - 26 hrs
THC
(Tetrahydrocannabinol)
(Dose-dependent)
30.3 hrs1.6 - 59 hrs
Theophylline9 hrs 7 - 11 hrs
Thienalprazolam25 hrs 10 - 40 hrs
Thioridazine22.5 hrs 21 - 24 hrs
Thiothixene15 hrs 10 - 20 hrs
Thorazine30 hrs 30 hrs
Tiagabine6.5 hrs 5 - 8 hrs
Tianeptine3 hrs 3 hrs
Tizanidine2.5 hrs 2.5 hrs
Tobramycin2 hrs 2 hrs
Tofranil
(* Imipramine)
13 hrs 6 - 20 hrs
Topamax
(* Topiramate)
22 hrs 19 - 25 hrs
Topiramate22 hrs 19 - 25 hrs
Tramadol7 hrs 6 - 8 hrs
Tranxene
(* Clorazepate Dipotassium)
2 days 48 hrs
Tranylcypromine2.5 hrs 2 - 3 hrs
Trazodone8.5 hrs 7 - 10 hrs
Triazolam3.5 hrs 1.5 - 5.5 hrs
Trifluoperazine15 hrs 10 - 20 hrs
Trilafon
(* Perphenazine)
14 hrs 8 - 20 hrs
Trileptal
(* Oxcarbazepine)
3 hrs 1 - 5 hrs
Trimethoprim10 hrs 8 - 12 hrs
Trimipramine27.5 hrs 16 - 39 hrs
Surmontil
(* Trimipramine)
27.5 hrs 16 - 39 hrs
Truxal
(* Chlorprothixene)
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
(Valproate)
12.5 hrs 9 - 16 hrs
Vancomycin7.5 hrs 4 - 11 hrs
Vardenafil4.5 hrs 4 - 5 hrs
Venlafaxine11 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
Warfarin40 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
Yohimbine1.4 hrs 15 - 150 mins
Zaleplon75 mins 60 - 90 mins
Ziprasidone7 hrs 7 hrs
Zofran
(* Ondansetron)
5.7 hrs 5.7 hrs
Zoloft
(* Sertraline)
29 hrs 13 - 45 hrs
Zolpidem2.5 hrs 2 - 3 hrs
Zonisamide2.6 days 53 - 75 hrs
Zopiclone5 hrs 4 - 6 hrs
Zotepine15 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] Wikipedia - List of Benzodiazepines; [2] Wikipedia - Equianalgesic; [3] Quest Diagnostics - Drug Half-Life, Steady State, and Recommended Sample Collection Time; [4] MentalMeds.org - Drug Information Tables



Note: All times displayed are GMT - 7.

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