Preventing lactic acidosis depends on what’s driving it. Lactic acidosis occurs when lactate builds up in the blood faster than the body can clear it, pushing blood lactate above 4 mmol/L and blood pH below 7.35. For some people, the risk comes from a medication like metformin. For others, it stems from liver disease, kidney problems, heavy alcohol use, or nutritional deficiencies. Each cause has its own prevention strategy, but they all share a common thread: keeping enough oxygen flowing to your tissues and making sure your liver and kidneys can do their jobs.
What Causes Lactate to Build Up
Your cells normally produce small amounts of lactate as a byproduct of energy production. When oxygen is plentiful, most of that lactate gets recycled. The liver converts it back into usable fuel through a process called gluconeogenesis. The kidneys help clear it too. Problems start when tissues don’t get enough oxygen (from shock, severe infection, or heart failure), when the liver or kidneys can’t keep up with clearance, or when a medication or toxin disrupts the normal metabolic process.
Once lactic acidosis takes hold, it tends to worsen itself. The rising acidity impairs the liver’s ability to clear lactate, which can actually turn the liver from a lactate-clearing organ into a lactate-producing one. This vicious cycle is why prevention matters so much more than treatment.
Metformin Safety for Diabetes Patients
Metformin is the most commonly discussed medication linked to lactic acidosis, though the actual risk is low when the drug is used correctly. The key safeguard is kidney function. Metformin can be used without dose adjustment as long as your glomerular filtration rate (a measure of how well your kidneys filter blood) stays above 30 mL/min. If you take metformin, your kidney function should be checked every three to six months.
There are specific situations where metformin needs to be paused temporarily:
- Before surgery: Stop metformin two days before general anesthesia.
- After contrast dye procedures: If you receive iodinated contrast for a CT scan or similar imaging, metformin should be withdrawn for three days and restarted only after kidney function has stabilized.
- During acute illness: Any condition that reduces oxygen delivery or blood flow, such as a heart attack, severe dehydration, or shock, means metformin should be stopped until the situation resolves.
If you’re on metformin and are scheduled for surgery or an imaging procedure, bring this up with your care team ahead of time. Many patients don’t realize they need to pause the medication temporarily.
Protecting Kidney and Liver Function
Your liver and kidneys are the two organs responsible for clearing lactate from the blood. Anything that damages them raises your baseline risk. For people with chronic kidney disease, that means being cautious with medications that stress the kidneys. NSAIDs (common painkillers like ibuprofen and naproxen) can worsen kidney damage, especially when combined with certain blood pressure medications or diuretics. Long-term lithium use at higher doses can also harm the kidneys over time.
Monitoring your eGFR regularly helps catch declining kidney function early, giving you and your provider time to adjust medications before lactate clearance becomes a problem. If you already have chronic kidney disease, regular bloodwork is essential for staying ahead of complications.
For people with liver disease, the prevention picture is more complex. In a study of 488 patients undergoing liver surgery, 72% developed elevated lactate levels afterward. The single most important factor in preventing lactic acidosis in liver disease is maintaining stable blood flow to the liver and kidneys. This means managing blood pressure, staying hydrated, and avoiding anything that further burdens the liver, particularly heavy alcohol use.
Alcohol and Nutritional Deficiencies
Heavy alcohol consumption creates a double risk. Alcohol directly disrupts the metabolic pathways that clear lactate, and chronic drinking often leads to poor nutrition, particularly thiamine (vitamin B1) deficiency. Thiamine is essential for cells to process energy using oxygen. Without it, cells shift to a less efficient pathway that generates excess lactate.
A CDC investigation linked thiamine deficiency directly to lactic acidosis in patients receiving intravenous nutrition without multivitamins. Adults generally need at least 3 to 5 mg of thiamine daily to maintain normal metabolism. Good dietary sources include whole grains, pork, legumes, and fortified cereals. For people who drink heavily, have had bariatric surgery, or rely on IV nutrition, thiamine supplementation is a straightforward way to reduce risk. Oral vitamin preparations work well for most people.
If you drink regularly and heavily, the most effective prevention step is reducing alcohol intake. But if that’s not immediately realistic, making sure you’re eating adequately and getting enough B vitamins provides a meaningful layer of protection.
During Serious Illness or Sepsis
The most dangerous form of lactic acidosis happens during severe infections and sepsis, when blood pressure drops and tissues stop receiving adequate oxygen. In these situations, prevention depends on rapid medical intervention. Current guidelines from the Surviving Sepsis Campaign recommend at least 30 mL per kilogram of IV fluid within the first three hours when sepsis causes low blood pressure or poor tissue perfusion.
The core principle is restoring blood flow to tissues as quickly as possible. Clinicians use dynamic measurements, like how your heart responds to a fluid challenge or a leg raise, to gauge whether more fluid is needed. The goal is to normalize lactate levels by ensuring oxygen-rich blood reaches the organs that need it.
For someone at home, the practical takeaway is recognizing early warning signs. Rapid breathing, confusion, extreme fatigue, and muscle weakness can all signal that lactate is building up. In people with existing risk factors (liver disease, kidney disease, diabetes on metformin, or recent surgery), these symptoms during an acute illness warrant urgent medical attention rather than a wait-and-see approach.
Exercise-Related Lactate Buildup
Exercise-induced lactate accumulation is fundamentally different from clinical lactic acidosis. During intense physical activity, your muscles produce lactate faster than your body can clear it, leading to that familiar burning fatigue. This is temporary and not dangerous in healthy people, but managing it can improve your performance and recovery.
Your body clears exercise-generated lactate through three main routes: muscles oxidize it directly as fuel, the liver converts it back to glucose, and small amounts leave through sweat and urine. You can support all three pathways with practical strategies.
Active recovery is the most effective approach. Light jogging, easy cycling, or gentle stretching after intense efforts keeps blood flowing to muscles, which accelerates lactate clearance far more effectively than simply sitting down. Pre-exercise nutrition also plays a role. Consuming alkaline-rich foods and drinks before training, such as fruits, vegetables, and mineral-rich beverages, helps buffer the acid produced during exercise. This can delay the point at which performance starts declining and reduce post-exercise fatigue.
Building your aerobic base through consistent training is the long-term solution. The fitter you are, the higher the intensity you can sustain before lactate starts accumulating faster than your body can handle it. This threshold shifts upward with regular endurance work, meaning the same pace that once left you gasping produces far less lactate after months of consistent training.
Staying Hydrated and Maintaining Blood Flow
Across nearly every cause of lactic acidosis, dehydration is an amplifying factor. When you’re dehydrated, blood volume drops, blood pressure falls, and tissues receive less oxygen. This pushes cells toward the oxygen-poor energy production that generates excess lactate. Meanwhile, reduced blood flow to the liver and kidneys impairs their ability to clear whatever lactate has been produced.
Consistent hydration is one of the simplest and most universally applicable prevention strategies. This is especially true during illness (when fluid losses increase from fever, vomiting, or diarrhea), before and after surgery, during hot weather, and around intense exercise. For people with kidney or liver disease, maintaining fluid balance is even more critical because their lactate clearance capacity is already reduced.