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Generic name: potassium phosphate and sodium phosphate [poe-TASS-ee-um-FOSS-fate-and-SEW-dee-um-FOSS-fate]

Brand names: K-Phos Neutral, K-Phos No. 2, PHOS NaK, and Phospha 250 Neutral. Also known as phosphorus supplements, list the 8 brands
The class of drugs: minerals and electrolytes

What is PHOS-NaK?

Phosphorus is a naturally occurring substance that plays an important role in every cell of the body. The majority of phosphorus within the body is in bones. The sodium and potassium salt forms of phosphorus are referred to as phosphates. The PHOS-NaK combination medicine is designed to make urine more acidic, which helps in the prevention of kidney stones. It is also possible to use PHOS NaK to treat conditions that are not mentioned in this guideline.

Side effects of PHOS-NaK

Contact a medical professional immediately. If you notice any of the following symptoms or warning signs of allergic reactions, such as hives, difficulty breathing or swelling of your lips, face, tongue, throat, or face,

PHOS-NaK can cause severe adverse effects. Consult your physician immediately in the event that you experience:

  • Chronic or persistent or severe diarrhea;
  • Seizures (convulsion);
  • Breathlessness or
  • Symptoms of kidney problems: little or no urination; painful or difficult urination; swelling on your ankles or feet; and feeling exhausted or weak.

Common negative side effects of PHOS NaK can include:

  • Nausea, vomiting, stomach pain, diarrhea;
  • Bones or joint joints;
  • Headache fatigue, dizziness, a shaky sensation;
  • Muscle pain or weakness;
  • More thirst increases thirst.
  • Numbness or tingling sensation

This is not a comprehensive list of possible side effects, and other side effects could be present. Consult your physician for advice regarding medical effects. You can report any adverse reactions to the FDA at 1-800-FDA-1088.


It is not recommended to take PHOS-NaK when you suffer from severe kidney disease or have high levels of phosphorus in your body.

Prior to use this drug

It is not recommended to take PHOS-NaK. If you are allergic to it or are suffering from:

  • Severe kidney disease severe kidney disease
  • High levels of phosphorus are present in your blood (hyperphosphatemia).

To ensure that this medication is appropriate for you, consult your doctor if:

  • A background of kidney stones in the past, but not so long ago;
  • Kidney disease;
  • Cirrhosis or another liver disease;
  • Hypertension in the level of blood potassium (hyperkalemia) or high blood levels of calcium (hypercalcemia) or sodium (hypernatremia);
  • Heart disease, high blood pressure;
  • The toxemia associated with pregnancy;
  • Addison's disorder (an adrenal gland disorder);
  • Breathing issues;
  • Pancreas disorder;
  • Thyroid disorder;
  • Swelling of your feet or hands
  • If you are dehydrated; or
  • If you are taking diuretics or a "water pill,"

FDA pregnant category C. It is not clear whether PHOS NaK could affect a newborn baby. Consult your physician if you are expecting or planning to become pregnant while taking this medication. It's not clear if the medicine is absorbed into breast milk or if there is a risk to the nursing infant. Consult your physician if you are breastfeeding a child. PHOS-NaK should never be given to a child less than 4 years of age without a physician's recommendation.

How to take PHOS NaK?

Follow all the instructions on the prescription label. Don't take this medication in smaller or larger quantities or for longer than the recommended time. Drink this medicine by drinking a glass of water. The PHOS-NaK is best consumed during meals and before bedtime. When you are taking this medication, you might require regular urine or blood tests.

The powder must be mixed with water before you consume it. Mix one packet of powder with around 1/3 cup (2.5 ounces) of water. Stir until it is completely dissolved. Take the mixture in a single swallow after mixing. Don't save the mixture for the future. Tablets may have to dissolve in water and be swallowed in their entirety. Follow the dosage instructions that are included in your medicine. If you've been through a series of kidney stones, it's possible to have old stones disappear after beginning treatment with PHOS-NaK. Keep the bottle at room temperature, free of heat, moisture, and light. Make sure the bottle is tightly shut when not being used.

What happens if I miss the dose?

You should take the missed dose as soon as you can remember. Avoid any missed doses if it's close to the time of the next dose. Don't take any extra medication to make up for the missed dose.

What happens if I overdose?

Get medical attention in an emergency or contact the poison help line at 1-800-222-1222.

Some symptoms of overdose may be a tingly or numb feeling and muscle stiffness, or the feeling of a limp, lack of motion, disorientation, a heavy feeling in your legs, irregular heartbeats, or the feeling that you may faint.

What should be avoided?

Talk to your doctor prior to using an antacid. Make sure you use only the one recommended by your physician. Certain anti-inflammatory medications could make it difficult for the body to take in PHOS NaK.

Do not add supplements to your diet that contain vitamin D or calcium unless your physician tells you to.

Avoid using sodium supplements or substitutes for salt when you are taking PHOS NaK, except if your doctor has instructed you to.

Interaction with other drugs

Other medications may be incompatible with potassium phosphate and sodium phosphate, which include prescription and non-prescription medicines, vitamins, and herbal products. Be sure to inform your healthcare providers about the medications you take now as well as any medication you begin or stop taking.