Adcal and Photopsia - a phase IV clinical study of FDA data

Summary:

Photopsia is reported as a side effect among people who take Adcal (calcium carbonate), especially for people who are female, 60+ old, also take Alendronic Acid, and have Psoriasis.

The phase IV clinical study analyzes which people have Photopsia when taking Adcal. It is created by eHealthMe based on reports of 4,800 people who have side effects when taking Adcal from the FDA, and is updated regularly.

What is Adcal?

Adcal has active ingredients of calcium carbonate. eHealthMe is studying from 4,844 Adcal users. Check the latest studies of Adcal.

What is Photopsia?

Photopsia (presence of perceived flashes of light) is found to be associated with 684 drugs and 808 conditions by eHealthMe. Check the latest studies of Photopsia.

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, 14, 2026

4,800 people reported to have side effects when taking Adcal.
Among them, 11 people (0.23%) have Photopsia.

Among these 11 people:

What is the gender of people who have Photopsia when taking Adcal? *

female: 90.91 %
male: 9.09 %

What is the age of people who have Photopsia when taking Adcal? *

What are other drugs people take besides Adcal? *

Alendronic Acid: 4 people, 36.36%
Clopidogrel: 2 people, 18.18%
Lamictal: 1 person, 9.09%

What are other side effects people have besides Photopsia? *

Visual Acuity Reduced (reduced clearness of vision): 8 people, 72.73%
Photophobia (extreme sensitivity to light): 8 people, 72.73%
Dry Mouth: 3 people, 27.27%
Weakness: 2 people, 18.18%
Joint Pain: 2 people, 18.18%
Back Pain: 2 people, 18.18%
Blister (small pocket of fluid within the upper layers of the skin caused by forceful rubbing (friction), burning, freezing, chemical exposure): 2 people, 18.18%
Chapped Lips (cracking, fissuring, and peeling of the skin f lip): 2 people, 18.18%
Eye Irritation: 2 people, 18.18%
Hair Color Changes: 2 people, 18.18%

What are the existing conditions these people have? *

Psoriasis (immune-mediated disease that affects the skin): 2 people, 18.18%
Epilepsy (common and diverse set of chronic neurological disorders characterized by seizures): 1 person, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Adcal and have Photopsia?

- Check whether Photopsia 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 Adcal:

Adcal (4,844 reports)

Photopsia treatments and more:

Photopsia (7,832 reports)

Browse all side effects of Adcal:

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 Photopsia:

Photopsia (684 drugs)

Browse all the conditions that are associated with Photopsia:

Photopsia (808 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on calcium carbonate (the active ingredients of Adcal) and Adcal (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.