A false positive result happens when a drug test indicates the presence of an illegal or controlled substance that wasn’t actually consumed. Such results can have serious consequences, affecting sports eligibility, employment, and even legal cases. While uncommon, some prescription medicines can cause a false positive in certain situations.
Sildenafil, known by the brand name Viagra, is an FDA-approved active ingredient used for the treatment of Erectile Dysfunction (ED). It works by increasing blood flow into the penis. ED medications are generally not included in standard screening tests, and Sildenafil is not commonly known to interfere with test results.
In this article, we will discuss whether Sildenafil can actually cause a false positive drug test, which medicines are linked to false positives, and which tests can detect Sildenafil. Additionally, you’ll learn key points to keep in mind when taking a Sildenafil-containing pill and undergoing screening.
Does Sildenafil cause a false positive drug test?
No, Sildenafil does not usually cause a false positive drug test. This is because it is not a controlled substance, and standard workplace or clinical urine drug tests do not commonly check for ED medicines.
Save up to 90% on your medicine bills
Cenforce 100 mg
Starting at just $0.65 per tabletBuy Now
Cenforce 200 mg
Starting at just $0.84 per tabletBuy Now
Kamagra Oral Jelly Rx 100 mg
Starting at just $13.12 per tabletBuy Now
Vidalista 60 mg
Starting at just $0.91 per tabletBuy NowA Urine Drug Screen (UDS) is a broad test that includes 5-, 10-, or 12-panel urine tests that usually check for substances such as:
- Amphetamines
- Benzodiazepines
- Cocaine
- Opioids
- Cannabinoids
- Phencyclidine (PCP)
These tests use specific antibodies to detect their chemical shape. Since Sildenafil is a Phosphodiesterase Type 5 (PDE5) inhibitor and has a different chemical structure from these substances, it is unlikely to react with standard immunoassay (performed at the initial screening stage) drug tests.
However, a recent 2023 study, following a 6-year review, reported that Sildenafil is among the medications frequently associated with false-positive results for Amphetamines. But the evidence is still limited, so this does not mean Sildenafil commonly causes false positives. If an unexpected result occurs, confirmatory testing can help identify the exact substance.
When can Sildenafil be detected in a drug test?
Sildenafil can be detected when the test is specifically designed to detect it. This includes targeted toxicology screening using advanced methods like Gas Chromatography/Mass Spectrometry (GC-MS) and High-Performance Liquid Chromatography (HPLC), which are used to test specific prescription medicines.
The most common samples for detecting this ED medicine are urine, blood, and hair. It can also show up in oral fluid (saliva), but it is not used in routine drug screening. Additionally, gastric content such as enzymes, mucus, and stomach acid can also be used to detect in forensic or post-mortem investigations.
Note that Sildenafil may remain traceable for about 24 hours after use, while its metabolite (substance that forms after the body breaks down a medicine), N-desmethylsildenafil, may stay for around 24-48 hours. This timing can vary depending on the dose, frequency of use, metabolism, liver or kidney function.
What can cause a false positive drug test?
False positives can happen even when a person has not taken any illegal or controlled substances. This usually occurs when an initial urine test reacts to a similar-looking compound by mistake. Other causes can include sample handling errors, contamination, mix-ups, or certain health conditions that affect test results.
Additionally, some prescription and over-the-counter medicines, as well as foods, can also trigger false positives by appearing similar to controlled substances on the first screening test. These foods/medicines include:
| Food/medicines involved | Positive false-positive for |
|---|---|
| Poppy seeds | Opioids |
| Antidepressant (Sertraline) | Benzodiazepines |
| HIV medicine (Efavirenz) | Marijuana (Cannabinoids) |
| Cough and cold medicine (Benadryl, Diphenhydramine) | Methadone, PCP |
| Antibiotic (Rifampin) | Opiates |
| Antipsychotic medicine (Quetiapine, Chlorpromazine) | Methadone, amphetamine |
Key considerations for a drug test while taking Sildenafil
Since Sildenafil is usually not checked in standard sports or workplace drug tests and is not a substance of abuse, no special preparation is needed before routine screening. Still, the following steps can help prevent confusion or unnecessary concern:
- Avoid discontinuation: There is no need to avoid or stop taking the medicine before a routine drug test. However, if you are concerned about an upcoming screening, consult your doctor before skipping or changing the dose.
- Disclose your medication: Before testing, inform the testing authority of your current medication list.
- Keep documentation: Keep a doctor’s note or prescription to verify the legal use of the medicine. It will also help avoid complications if the test gives an unexpected result.
Conclusion
Sildenafil, approved for treating ED, does not usually cause a false positive drug test. It is not commonly included in standard workplace or sports urine drug screens, which usually check for cocaine, amphetamines, opioids, and benzodiazepines. However, one 2023 study linked Sildenafil with some false-positive amphetamine results, so confirmatory testing is important if an unexpected result appears.
Sildenafil can be identified through advanced tests such as GC-MS or HPLC, using samples like urine, blood, or hair. False positives usually happen due to cross-reactivity, sample errors, health conditions, or certain medicines such as antidepressants and antibiotics.
Do not stop taking Sildenafil Citrate before a drug test unless your doctor advises it, as this is usually not needed. If you are concerned, inform the testing authority about your medicine and keep your prescription available to confirm its legal use.
Frequently Asked Questions
How long does Sildenafil last in the urine?
Sildenafil is generally detectable in the urine for approximately 24 hours after taking a single dose. However, this can vary depending on an individual’s metabolism, age, dosage, and liver or kidney function.
What is the most common false positive drug test?
Amphetamine screens are among the most common sources of false positive results on urine drug tests. This is because several medicines, including some decongestants and antidepressants such as Bupropion, can cross-react with initial immunoassay tests. A confirmatory test can help verify the result.
What’s the fastest way to clean your urine for a drug test?
There is no fastest or safest way to clean your urine for a drug test, since only the normal body metabolism can reduce the medication levels after the intake. Methods like detox drinks, drinking excessive water, and baking soda are unreliable and can be dangerous.
Can Tadalafil cause a false positive drug test?
No, Tadalafil does not usually cause a false positive drug test. Like Sildenafil, it is a PDE5 inhibitor and is not commonly checked in standard workplace urine drug screens. However, if a test is specifically designed to detect ED medicines, Tadalafil may be identified through targeted toxicology testing.
GoodRxMedicine only refers to credible, authoritative sources for our content. If you're curious about how we ensure the integrity of our content, we encourage you to read our Content Information Policy.
Julian Carter is a highly accomplished MBA graduate in Pharmaceutical Management, celebrated for his extensive experience and exceptional skills in the pharmaceutical industry. With a wealth of knowledge and expertise, Julian is a valuable contributor to the field and a trusted voice in pharmaceutical management.
As a contributing writer for Goodrxmedicine.com, Julian is committed to educating and empowering individuals to make informed decisions about their health. His passion for the industry is evident in his work, and his dedication to improving the lives of others through education and empowerment is truly remarkable.
With a reputation for excellence and a track record of success, Julian Carter is a respected and admired figure in pharmaceutical management. His insights and contributions to the field are highly valued, and her expertise has helped shape the direction of the industry for the better.
Through his work as a contributing writer for Goodrxmedicine.com and beyond, Julian continues to make a meaningful impact in the lives of many. His commitment to excellence and dedication to improving the health of individuals and communities around the world make him an inspiration to others in the field.
