Medicines & Supplements A to Z > Phosphorus (Supplement)

Phosphorus (Supplement)

Last updated on 18/03/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Phosphorus 



DRUG CLASS: Trace mineral 

USED FOR: Phosphorus deficiency 

OTHER DRUGS IN THE SAME CLASS: Chromium, Copper, Iron, Manganese, Selenium, Zinc


What is Phosphorus for?

Phosphorus is one of the trace minerals like Iron that regulates the body’s physiological functions. It is important in carbohydrates and fat utilization, protein synthesis and energy production. The recommended daily dietary intake of Phosphorus for adults is 700 mg. Phosphorus exists as either Potassium Phosphate or Sodium Phosphate in supplements. You should only take a Phosphorus supplement when you have a Phosphorus deficiency or are unable to take sufficient Phosphorus from your diet. Symptoms of Phosphorus deficiency include muscle weakness, osteoporosis and rickets.

How to use it?

In Hong Kong, Phosphorus supplements are available in oral dosage forms like tablets, or in injection forms combined with other nutrients. The usual adult dose is 250-500 mg elemental Phosphorus four times daily.

What are the side effects of Phosphorus?

Side effects of Phosphorus supplements are nausea and vomiting, diarrhoea, muscle cramps and headache.

Who should not take Phosphorus?

– People with high blood level of Phosphorus/ Phosphate
– People with infected urinary phosphate stones or poor kidney function

Pharmacist Tips:

Most people should obtain adequate amounts of Phosphorus from a healthy diet. Phosphorus is present in many foods including fruits, vegetables, dairy products, processed and unprocessed meats, cereals and grains.

Common dosing schedule:
Take Phosphorus with a full glass of water at mealtime and at bedtime. 

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Phosphorus may interact with:
– Angiotensin II receptor blockers, e.g. Losartan, Valsartan
– Angiotensin converting enzyme inhibitors, e.g. Enalapril, Lisinopril
– Antacids, e.g. Aluminium Hydroxide
– Non-steroidal anti-inflammatory drugs (NSAIDs), e.g. Aspirin, Ibuprofen, Naproxen

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Phosphorus in Hong Kong?

In Hong Kong, Phosphorus supplements can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. Injectable Phosphorus is a prescription drug, and patients can only receive the injection in the hospital. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health. 

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Phosphorus in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.