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Av-Phos 250 Neutral Side Effects

Generic name: potassium phosphate / sodium phosphate

Medically reviewed by Last updated on Mar 14, 2024.

Note: This document contains side effect information about potassium phosphate / sodium phosphate. Some dosage forms listed on this page may not apply to the brand name Av-Phos 250 Neutral.

Applies to potassium phosphate / sodium phosphate: oral tablet.

Serious side effects of Av-Phos 250 Neutral

Along with its needed effects, potassium phosphate/sodium phosphate may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking potassium phosphate / sodium phosphate:

Incidence not known

Other side effects of Av-Phos 250 Neutral

Some side effects of potassium phosphate / sodium phosphate may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Incidence not known

For Healthcare Professionals

Applies to potassium phosphate / sodium phosphate: oral powder for reconstitution, oral tablet.


Frequency not reported: Gastrointestinal upset (diarrhea, nausea, stomach pain, vomiting), laxative effect[Ref]

There have been reports of a laxative effect occurring over the first few days of therapy. Lowering the dose usually reverses this effect; however, discontinuation of therapy is sometimes necessary.[Ref]


Frequency not reported: Bone and joint pain (possible phosphate-induced osteomalacia), weakness or heaviness of legs, muscle cramps[Ref]

Nervous system

Frequency not reported: Headaches, dizziness, mental confusion, seizures, numbness/tingling/pain/weakness of hands or feet, numbness or tingling around lips[Ref]


Frequency not reported: Fast or irregular heartbeat[Ref]


Frequency not reported: Unusual tiredness or weakness, swelling of feet or lower legs, unusual weight gain[Ref]


Frequency not reported: Shortness of breath or trouble breathing[Ref]


Frequency not reported: Unusual thirst[Ref]


Frequency not reported: Low urine output[Ref]


1. Product Information. K-Phos No. 2 (potassium phosphate-sodium phosphate). Beach Pharmaceuticals. 2018.

2. Product Information. Phospho-Trin 250 Neutral (potassium phosphate-sodium phosphate). Patrin Pharma. 2018.

3. Product Information. Av-Phos 250 Neutral (potassium phosphate-sodium phosphate). AvKare Inc. 2018.

4. Product Information. Virt-Phos 250 Neutral (potassium phosphate-sodium phosphate). Virtus Pharmaceuticals LLC. 2018.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.