September 19, 2021

Bactrim Side Effects

Bactrim is a generic drug available under trade names like trimethoprim or sulfamethoxazole. It is actually a mix of these two antibiotics and is used to treat bronchitis, pneumonia, traveler’s diarrhea, urinary tract infections or bacterial infections. Bactrim is normally available in doses of 400 milligrams of sulfamethoxazole and 80 milligrams of trimethoprim as well as a double strength version. This medication is not recommended for patients who are allergic to sulfa compounds.

Side Effects for Bactrim

Individuals who take Bactrim might suffer from side effects like loss of appetite, sore throats, nausea, itching and vomiting. Anyone who experiences serious side effects like mouth sores, necrosis, anemia, bruising or jaundice should immediately contact their doctor. Pregnant women should only use Bactrim if their doctor believes the benefits will outweigh the risks. Bactrim can cause severe side effects for a fetus or for a baby that is breastfeeding.

Some of the common Bactrim side effects include:

bactrim side effects– Decreased urination
– Bruising
– Nervousness
– Mouth sores
– Fatigue
– Sore throats
– Insomnia
– Shortness of breath
– Tinnitus
– Bloody diarrhea
– Rashes
– Itching
– Vomiting or nausea

Certain side effects associated with using Bactrim can be severe and cause ongoing complications.

Individuals with any of the following symptoms should immediately seek medical care:

– Shortness of breath
– Hypoglycemia
– Depression
– Fatigue or pale skin
– Anemia
– Hallucinations
– Signs of kidney damage
– Symptoms of low blood platelet counts like unusual bleeding or bruising
– Seizures
– Low heart rate
– Low white blood cell counts
– Hyperkalemia
– Signs of liver damage like jaundice, stomach pain or dark urine
– Muscle weakness

Some patients may be allergic to Bactrim. Signs of an allergic reaction include hives, swelling, problems breathing or itching. Anyone with an allergy should see a health care provider for emergency care and to figure out an alternative treatment method.


Anyone who is allergic to sulfa medications should not take Bactrim. Patients should tell their doctor about any medical problems concerning the kidneys, asthma, anemia, liver problems or metabolic disorder. Using Bactrim can cause increased photosensitivity. While taking Bactrim, patients should make sure to use sunblock when they are outside and avoid tanning salons.

Older individuals may be more sensitive to Bactrim. Elderly patients are more likely to experience elevated potassium levels, skin problems, easy bruising or blood disorders.

One of the problems with figuring out side effects of Bactrim is that they are not always known. Bactrim was available for sale before the FDA required extensive clinical studies of the effects. Because of this, not all short term and long term effects of the drug are known. Patients should always tell their doctor about any medications they are on before taking Bactrim. Some over-the-counter drugs and herbal supplements can impede the function of Bactrim or cause negative drug interactions.

bactrimWomen who are on birth control should be especially careful while they are taking Bactrim. Studies have shown that some antibiotics can decrease the efficacy of contraceptive drugs. To be safe, women should use a backup form of birth control at least until their next menstrual cycle. If women are concerned about this potential side effect, they should discuss it with their doctor before taking Bactrim.

Individuals who are on blood thinners like warfarin may find that Bactrim interacts negatively with these drugs. Other drugs that can cause problems include live vaccines, cyclosporine, methenamine, dofetilide or methotrexate.

Anyone who is about to take Bactrim should always discuss any medical conditions or medications that they currently on. Patients who experience side effects can visit their doctor to find alternative treatments. In the case of severe side effects, patients should always visit their doctor for further testing and emergency treatment. Any symptoms that are out of the ordinary could be a sign of something wrong. Only a physician can decide if your side effects were caused by Bactrim.