Contac 12 hour and Blindness - a phase IV clinical study of FDA data

Summary:

Blindness is reported as a side effect among people who take Contac 12 hour (chlorpheniramine maleate; phenylpropanolamine hydrochloride), especially for people who are male, 40-49 old, also take Dimetapp, and have Nasopharyngitis.

The phase IV clinical study analyzes which people have Blindness when taking Contac 12 hour. It is created by eHealthMe based on reports of 1,131 people who have side effects when taking Contac 12 hour from the FDA, and is updated regularly.

What is Contac 12 hour?

Contac 12 hour has active ingredients of chlorpheniramine maleate; phenylpropanolamine hydrochloride. eHealthMe is studying from 1,137 Contac 12 hour users. Check the latest studies of Contac 12 hour.

What is Blindness?

Blindness is found to be associated with 1,505 drugs and 1,990 conditions by eHealthMe. Check the latest studies of Blindness.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Sep, 04, 2026

1,131 people reported to have side effects when taking Contac 12 hour.
Among them, 12 people (1.06%) have Blindness.

Among these 12 people:

What is the gender of people who have Blindness when taking Contac 12 hour? *

female: 50 %
male: 50 %

What is the age of people who have Blindness when taking Contac 12 hour? *

What are other drugs people take besides Contac 12 hour? *

Dimetapp: 4 people, 33.33%
Contac: 3 people, 25.00%
Warfarin Sodium: 1 person, 8.33%
Vicks Formula 44: 1 person, 8.33%
Fosinopril Sodium: 1 person, 8.33%
Digoxin: 1 person, 8.33%
Chlorpheniramine Maleate: 1 person, 8.33%

What are other side effects people have besides Blindness? *

Memory Loss: 7 people, 58.33%
Fainting (loss of consciousness and postural tone): 5 people, 41.67%
Stress And Anxiety: 4 people, 33.33%
Injury: 4 people, 33.33%
Emotional Distress: 4 people, 33.33%
High Blood Pressure: 3 people, 25.00%
Fatigue (feeling of tiredness): 3 people, 25.00%
Anhedonia (inability to experience pleasure from activities usually found enjoyable): 3 people, 25.00%
Stroke (sudden death of a portion of the brain cells due to a lack of oxygen): 2 people, 16.67%
Dizziness (Excl Vertigo): 2 people, 16.67%

What are the existing conditions these people have? *

Nasopharyngitis (inflammation of the nasopharynx): 4 people, 33.33%

* Approximation only. Some reports may have incomplete information.

Do you take Contac 12 hour and have Blindness?

- Check whether Blindness is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

Effectiveness of, long term effects of, and alternative drugs to Contac 12 hour:

Contac 12 hour (1,137 reports)

Blindness treatments and more:

Blindness (45,948 reports)

How severe was Blindness and when was it recovered:

Blindness in Contac 12 hour

Expand to all the drugs that have ingredients of chlorpheniramine maleate; phenylpropanolamine hydrochloride:

Blindness and drugs with ingredients of chlorpheniramine maleate; phenylpropanolamine hydrochloride (75 reports)

Sub-studies by gender and age:

Female: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Male: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Browse all side effects of Contac 12 hour:

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 z

Browse all the drugs that are associated with Blindness:

Blindness (1,505 drugs)

Browse all the conditions that are associated with Blindness:

Blindness (1,990 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on chlorpheniramine maleate; phenylpropanolamine hydrochloride (the active ingredients of Contac 12 hour) and Contac 12 hour (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

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.

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.