Co-codamol and Visual acuity reduced - a phase IV clinical study of FDA data

Summary:

Visual acuity reduced is reported as a side effect among people who take Co-codamol (acetaminophen; codeine phosphate), especially for people who are male, 60+ old, also take Omeprazole, and have Hiatal hernia.

The phase IV clinical study analyzes which people have Visual acuity reduced when taking Co-codamol. It is created by eHealthMe based on reports of 1,873 people who have side effects when taking Co-codamol from the FDA, and is updated regularly.

What is Co-codamol?

Co-codamol has active ingredients of acetaminophen; codeine phosphate. It is often used in pain. eHealthMe is studying from 2,364 Co-codamol users. Check the latest studies of Co-codamol.

What is Visual acuity reduced?

Visual acuity reduced (reduced clearness of vision) is found to be associated with 1,491 drugs and 1,887 conditions by eHealthMe. Check the latest studies of Visual acuity reduced.

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 Aug, 30, 2026

1,873 people reported to have side effects when taking Co-codamol.
Among them, 11 people (0.59%) have Visual acuity reduced.

Could Co-codamol cause Visual acuity reduced?

Among these 11 people:

What is the gender of people who have Visual acuity reduced when taking Co-codamol? *

female: 18.18 %
male: 81.82 %

What is the age of people who have Visual acuity reduced when taking Co-codamol? *

What are other drugs people take besides Co-codamol? *

What are other side effects people have besides Visual acuity reduced? *

Dry Eyes (lack of adequate tears): 7 people, 63.64%
Weakness: 6 people, 54.55%
Depression: 6 people, 54.55%
Headache (pain in head): 6 people, 54.55%
Dry Mouth: 6 people, 54.55%
Fall: 5 people, 45.45%
Weight Decreased: 5 people, 45.45%
Hyperchlorhydria (gastric acid levels are higher in stomach): 5 people, 45.45%
Mouth Haemorrhage (bleeding from mouth): 5 people, 45.45%
Nausea (feeling of having an urge to vomit): 5 people, 45.45%

What are the existing conditions these people have? *

Hiatal Hernia (hernia resulting from the protrusion of part of the stomach through the diaphragm): 4 people, 36.36%
Periarthritis (inflammation of the external coats of an artery and of the tissues around the artery): 3 people, 27.27%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 3 people, 27.27%
Salivary Hypersecretion (excess saliva secretion): 1 person, 9.09%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 1 person, 9.09%
Psoriasis (immune-mediated disease that affects the skin): 1 person, 9.09%
Polypoidal Choroidal Vasculopathy (polyp-like sub-retinal pigment epithelium vascular abnormalities predominantly found in the macula and peripapillary region): 1 person, 9.09%
Herpes Zoster: 1 person, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Co-codamol and have Visual acuity reduced?

- Check whether Visual acuity reduced 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 Co-codamol:

Co-codamol (2,364 reports)

Visual acuity reduced treatments and more:

Visual acuity reduced (45,479 reports)

How severe was Visual acuity reduced and when was it recovered:

Visual acuity reduced in Co-codamol

Expand to all the drugs that have ingredients of acetaminophen; codeine phosphate:

Visual acuity reduced and drugs with ingredients of acetaminophen; codeine phosphate (105 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 Co-codamol:

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 Visual acuity reduced:

Visual acuity reduced (1,491 drugs)

Browse all the conditions that are associated with Visual acuity reduced:

Visual acuity reduced (1,887 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on acetaminophen; codeine phosphate (the active ingredients of Co-codamol) and Co-codamol (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.