Catapres-tts-2 vs. Viagra: side effect and effectiveness comparison (a real world drug study)
Summary:
We compare the side effects and drug effectiveness of Catapres-tts-2 and Viagra. The phase IV clinical study is created by eHealthMe based on reports (from sources including the FDA) of 233,712 people who take Catapres-tts-2 and Viagra, and is updated regularly.
What is Catapres-tts-2?
Catapres-tts-2 has active ingredients of clonidine. It is often used in high blood pressure. eHealthMe is studying from 130 Catapres-tts-2 users. Check the latest studies of Catapres-tts-2.
What is Viagra?
Viagra has active ingredients of sildenafil citrate. It is often used in erection problems. eHealthMe is studying from 63,865 Viagra users. Check the latest studies of Viagra.
233,712 people who take Catapres-tts-2 and Viagra are studied.

Drugs being compared in this study:
- Viagra (sildenafil citrate)
- Catapres-Tts-2 (clonidine)
Most common side effects of the drugs, overall:
Most common side effects of the drugs, in long term (1+ years) use:
Drug effectiveness:
Catapres-Tts-2:
- not at all: 4.14 %
- somewhat: 20.28 %
- moderate: 34.24 %
- high: 31.3 %
- very high: 10.03 %
Viagra:
- not at all: 3.11 %
- somewhat: 13.58 %
- moderate: 33.19 %
- high: 35.58 %
- very high: 14.55 %
Want to compare Catapres-tts-2 with Viagra?
- Personalize this study to your gender and age (0-99+)How to use the study?
DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.
Related publications that referenced our studies
- Jeong SY, Jeon SJ, Kim YR, Choi SS, Kwak HS, "A Rare Case of Viagra Induced Toxic Encephalopathy", Investigative Magnetic Resonance Imaging, 2016 Sep .
- Teimoory M, Arefi M, Behnoush B, Bastani B, "Promethazine and Treatment Refractory Agitation in Clonidine Toxicity", International Journal of Medical Toxicology and Forensic Medicine, 2013 Mar .
- Jeong SY, Jeon SJ, Kim YR, Choi SS, Kwak HS, "A Rare Case of Viagra Induced Toxic Encephalopathy", Investigative Magnetic Resonance Imaging, 2016 Sep .
- Teimoory M, Arefi M, Behnoush B, Bastani B, "Promethazine and Treatment Refractory Agitation in Clonidine Toxicity", International Journal of Medical Toxicology and Forensic Medicine, 2013 Mar .
Related studies
Alternative drugs to, pros and cons of:
- Catapres-tts-2 (118 reports)
- Viagra (61,813 reports)
Browse all side effects of Catapres-tts-2:
a b c d e f g h i j k l m n o p q r s t u v w x y zBrowse all side effects of Viagra:
a b c d e f g h i j k l m n o p q r s t u v w x y zHow the study uses the data?
The study is based on clonidine and sildenafil citrate (the active ingredients of Catapres-tts-2 and Viagra, respectively). Other drugs that have the same active ingredients (e.g. generic drugs or brand names) are also considered. Dosage of drugs is not considered in the study.
Who is eHealthMe?
With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).
WARNING, DISCLAIMER, USE FOR PUBLICATION
WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.
DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.
If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.
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