Cephalexin is a commonly prescribed antibiotic used to treat various bacterial infections throughout the body, including those affecting the respiratory tract, ears, skin, bones, and urinary tract. As with any medication, individuals starting a new prescription often wonder about potential side effects. Concerns about changes in body weight are a common consideration when beginning a new treatment regimen.
Cephalexin and Weight Changes
Weight gain is not a direct or common side effect of Cephalexin. However, some individuals might experience perceived weight fluctuations due to indirect factors related to the medication or the underlying infection. A rare side effect is sudden, unintentional weight gain due to fluid buildup, which can be a sign of kidney damage, especially when used with certain other medications or in individuals with pre-existing kidney issues.
Gastrointestinal upset, including nausea, vomiting, or diarrhea, are common side effects of Cephalexin. These can lead to temporary changes in appetite or hydration. Dehydration from diarrhea might cause temporary weight decrease, while rehydration could lead to a perceived increase as the body regains fluids. These fluctuations are temporary and do not represent actual fat gain.
Feeling better after an infection can lead to a return of appetite. If eating less due to illness, resuming normal habits after recovery might be perceived as weight gain. This is a return to usual caloric intake as health improves, not a direct effect of the antibiotic.
Other Common Side Effects
Beyond indirect weight changes, Cephalexin can cause other common side effects, primarily affecting the digestive system. These include diarrhea, nausea, vomiting, indigestion, and stomach pain. These gastrointestinal issues occur because antibiotics like cephalexin can disrupt the natural balance of bacteria in the gut.
Other mild side effects include dizziness, headaches, and vaginal yeast infections. These effects are mild and often resolve as the body adjusts to the medication or after treatment is completed.
When to Consult a Doctor
Most side effects of Cephalexin are mild and temporary, but it is important to know when to seek medical attention. You should consult a doctor if you experience persistent or severe side effects, including any unexplained or significant weight changes that cause concern.
Seek immediate medical attention if you notice signs of a more serious reaction, such as a severe allergic reaction. Symptoms of a severe allergic reaction can include hives, difficulty breathing, swelling of the face, lips, tongue, or throat. If symptoms of the original infection do not improve or worsen, or if you develop severe watery or bloody diarrhea, contact your healthcare provider promptly. This information serves as a general guide and is not a substitute for professional medical advice.