KnowDrugs Drug Checking

In-app purchases
1.9K reviews
Content rating
Mature 17+
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About this app

KnowDrugs is the easiest way to lookup drug testing results, pill warnings and drug alerts and provides you with drug info about more than 200 drugs, along with advice on harm reduction and safer use. Taking drugs always involves risks - however, if you do decide to take drugs, KnowDrugs can help you to take appropriate measures to reduce potential harms.


Check the profiles of more than 200 drugs for educational purposes: Stimulants like MDMA and Amphetamine, depressants such as Alcohol and Benzodiazepines or psychedelics like 2C-B, LSD and DMT.

KnowDrugs provides you with drug education harm reduction advice, focusing on MDMA / Molly / Ecstasy and other psychoactive substances. Knowing about the wanted and unwanted effects of drugs, their duration, interactions and risks helps you to make more informed decisions, reduce risks and reflect upon your drug habits and consumption behaviour.


Search for drug name, substance or location, to find drug alerts from nearby and learn about their ingredients and dosage strength to avoid overdose and particularly dangerous cuts (e.g. PMA).

Drug checking or pill testing is a way to reduce the harm from drug consumption by allowing users to find out the content and purity of substances that they intend to consume. This empowers users to make safer choices: to avoid more dangerous substances and combination and to use smaller quantities.

If you don't have access to professional drug testing services, looking up recent drug testing results can still help you make a more informed decision about your consumption.


Harm reduction aims to minimize the harms associated with recreational substance use. The harm reduction approach follows from the idea that substance use is a high-risk activity that innately entails the possibility of injury, addiction, and death. Therefore, the best strategy one can employ (outside of avoiding use entirely) is to take appropriate measures to mitigate its potential harms.

KnowDrugs highlights the harm-potential of more than 200 substances and demonstrates strategies on how to reduce the harms associated with the consumption of drugs.


- learn how to spot and react in case of an emergency, take care of someone experiencing a bad trip at a party or festival
- find a free and confidential counselling service which accepts you and your personal choices, and helps you develop the right strategies and competencies if you want to change something about your consumption behaviour.
Updated on
Feb 10, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Financial info and 2 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

1.86K reviews
A Google user
August 11, 2019
Gives unprompted and unwanted notifications, imagine you're showing somebody your phone who doesn't know about your drug habits and a notification pops up. Decent application other than that and will revert to a good review when these are removed, or made opt-in only. EDIT: I know how to disable notifications system-wide but by that point it could already be too late. I maintain there should only be opt-in notifications, it's as simple as prompting the user when they first launch the application.
80 people found this review helpful
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Plant Product Design
August 9, 2019
Hi Alexandre, I can understand your concerns. On Android, Push-notifications are enabled by default but you can easily turn them off by going to Settings - Apps & Notifications - KnowDrugs - Notifications. Alternatively you can also swipe a notification slightly to the right and disable by tapping on the settings-icon. Hope that helps!
A Google user
September 23, 2018
The app is great for learning about all types of drugs. I like how it also lists its soures, but the app can be improved on. For example, almost every single drug I see is MDMA. Mix it up! Not every drug is MDMA. Also, it would be cool if you could go to the Substances tab and click on a substance that has a drop down on all drugs affiliated. Like if I click on Nicotine, there would be a dropdown list of all drugs containing nicotine.
138 people found this review helpful
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Jared Tamana
October 6, 2022
Data is inaccurate or incomplete. Provides sources, but when going to the corresponding page, information can be completely different. For example, for DeeEmmTee, the app reports that PsychonautWiki says there is unsafe interaction with SSRIs, when no interaction is listed at that source. I really appreciate this app's vision, but if the info is inaccurate, it can actually lead to greater harm.
35 people found this review helpful
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What's new

Fixed a bug that prevented links to counselling organisations from opening in Google Maps