Fentanyl Test Strips


Fentanyl Test Strips is the basis to start quickly and easily detecting the presence of fentanyl admixture (but not quantity, purity or concentration):

  • 1 x Hermetically sealed Fentanyl Test Strip

By shopping with SIN you support harm reduction and fight for drug policy based on facts and human rights, not prejudice.



By purchasing the Fentanyl Test Strips you support our fight for drug policy based on harm reduction, human rights, and facts, not prejudice.  



Fentanyl is an extremely potent synthetic opioid, with derivatives often from 50 to 100 times stronger than heroin. Fentanyl is in big part responsible for the epidemic opioid overdoes due to its extreme potency. It can be lethal even in doses invisible to the bare eye. It is often found in counterfeit medicine, non-opioid research chemicals or street drugs like cocaine. When fentanyl is mixed with heroin, cocaine or other substances, it is * never * evenly mixed. Powder on one side of a baggy can contain no fentanyl, while powder from the other side might contain a lethal dose. It’s extremely important to always test each and every dose intended for consumption.

How to test fentanyl:

If you intend to use an opioid, first you need to check it using a test kit to rule out presence of dangerous adulterants such as fentanyl. Fentanyl can be even 100 times more potent than morphine, and therefore is easy to accidentaly overdose on. Fentanyl can be mixed in any kind of sample and can’t be identified by appearance. To detect fentanyl or analogs it’s recommended to use fentanyl test strips.

Why use fentanyl testing strips? Lethal dose of fentanyl can be invisible to naked eye and can’t be identified by appearence.


How can I test fentanyl?

BEFORE using a fentanyl test strip

  • It’s RECOMMENDED to test each and every dose. Because of extreme potency (microgram range) fentanyl is never evenly mixed in.

STEP ONE for testing fentanyl powder / pills / spice

  • Dissolve 100-200 mg in at least 125 ml of water (half a cup).
  • Grab a test strip by blue end and insert it into the liquid, no higher than the blue line.
  • Wait until liquid starts visibly moving up the test strip (up to 15 seconds).
  • Put the test strip away on a flat dry surface and read the result in 2 minutes.

How to use a fentanyl test strip?

  • Check test strip results: a single line confirms the presence of fentanyl, while two lines (even faint) rule it out.

Test Strip for testing Fentanyl
How to test fentanyl? Fent strips instructions.

Fentanyl test did not react as indicated? Watch out!
All test results are available in our instructions and TestDrugs apps.


  • Faint line. Even faint second line result is enough to rule out the presence of fentanyl.
  • Injecting. If you inject you especially need to test each and every dose. It’s best to test the spoon (or cooker) residue every time before use.
  • Speed of the reaction does not indicate quantity nor purity. However, if you are having trouble interpreting your result try using a bigger sample or crushing it better before testing.
  • How many tests can you get from one test kit? A single fentanyl test strip is enough for one test.

Fentanyl Test Strips

Fentanyl Test Strips consists of testing strips with special antibodies. Fentanyl testing strips were designed to screen urine for past use of fentanyl, but can also be used to test substance samples for the presence of fentanyl and its analogs, e.g. alfentanil, fenfluramine, norfentanyl, buspirone, Sufentanyl, Tiophenfentanyl (documented by SIN) and benzylfentanyl (documented by SIN).


The following (and more) compounds show no cross-reactivity when tested with the Fentanyl Test Strips at a concentration of 100 μg/mL:

4-Acetaminophenol Acetone Acetophenetidin N-Acetylprocainamide Acetylsalicylic acid Albumin Amitriptyline Amobarbital Amoxapine Amoxicillin Ampicillin Ascorbic acid Aminopyrine Apomorphine Aspartame Atropine Benzilic acid Benzoic acid Benzphetamine Bilirubin Brompheniramine Caffeine Cannabidiol Cannabinol Cimetidine Chloral hydrate Chloramphenicol Chlordiazepoxide Chloroquine Chlorothiazide (+)-Chlorpheniramine (±)-Chlorpheniramine Chlorpromazine Chlorprothixene Cholesterol Clomipramine Clonidine Codeine Cortisone (-)-Cotinine Creatinine Cyclobarbital Cyclobenzaprine Deoxycorticosterone R(-)Deprenyl Dextromethorphan Diazepam Diclofenac Dicyclomine Diflunisal 4-Dimethylaminoantipyrine Diphenhydramine 5,5-Diphenylhydantoin Disopyramide Doxylamine Ecgonine Ecgonine methylester EMDP Ephedrine l-Ephedrine l-Epinephrine (±)-Epinephrine Erythromycin β-Estradiol Estrone-3-sulfate Ethanol (Ethyl alcohol) Ethyl-p-aminobenzoate Etodolac Famprofazone Fenoprofen Fluoxetine Furosemide Gentisic acid d-Glucose Guaiacol glyceryl ether Hemoglobin Hydralazine Hydrochlorothiazide Hydrocodone Hydrocortisone o-Hydroxyhippuric acid p-Hydroxymethamphetamine Hydromorphone 3-Hydroxytyramine (Dopamine) Hydroxyzine Ibuprofen Imipramine Iproniazide (-)-Isoproterenol Isoxsuprine Kanamycin Ketamine Ketoprofen Labetalol Levorphanol Lidocaine Lindane (Hexachlorocyclohexane) Loperamide Maprotiline Meperidine Meprobamate d-Methamphetamine l-Methamphetamine Methaqualone Methadone Methoxyphenamine (+)-3,4-Methylendioxy-methamphetamine Methylphenidate Mephentermine Metoprolol Morphine-3-β-D-glucuronide Morphine sulfate Methyprylon Nalidixic acid Nalorphine Naloxone Naltrexone α-Naphthaleneacetic acid Naproxen Niacinamide Nifedipine Nimesulide Norcodeine Normorphine Norethindrone d-Norpropoxyphene Noscapine d,l-Octopamine Orphenadrine Oxalic acid Oxazepam Oxolinic acid Oxycodone Oxymetazoline Oxymorphone Papaverine Pemoline Penicillin-G Pentazocine Pentobarbital Perphenazine Phencyclidine Phenelzine Pheniramine Phenobarbital Phenothiazine Phentermine Prednisolone Prednisone Procaine Promazine Promethazine l-Propoxyphene d,l-Propranolol d-Pseudoephedrine Quinacrine Quinidine Quinine Ranitidine Riboflavin Salicylic acid Secobarbital Serotonin (5-Hydroxytryptamine) Sodium chloride Sulfamethazine Sulindac Sustiva (Efavirenz) Temazepam Tetracycline Tetrahydrocortexolone Tetrahydrocortisone, 3-acetate Tetrahydrozoline Thebaine Theophylline Thiamine Thioridazine l-Thyroxine Tolbutamide cis-Tramadol trans-2-Phenylcyclopropylamine Trazodone Trimethobenzamide Triamterene Trifluoperazine Trimethoprim Trimipramine Tryptamine d,l-Tryptophan Tyramine d,l-Tyrosine Uric acid Verapamil Digoxin Lithium carbonate l-Phenylephrine


A sample that tested negative MIGHT STILL CONTAIN A LETHAL DOSE of fentanyl or other synthetic opioids. TESTING DOES NOT GUARANTEE SAFETY! No substance is 100% safe!

Additional information

Weight 0.049 kg

1, 10, 100


There are no reviews yet.

Be the first to review “Fentanyl Test Strips”

You may also like…