Bactrim DS is a medication in a class of drugs known as antibiotics. Antibiotics are used to kill foreign bacteria in the body. Bactrim is used to treat infections such as urinary tract infections, middle ear infections, bronchitis, traveler's diarrhea, shigellosis, and to prevent or treat Pneumocystis carinii pneumonia, says MayoClinic.com 1.

Nausea and Vomiting

Bactrim DS may cause nausea and vomiting, says PDRHealth.com 1. These side effects may diminish over a few days as the body adjusts to Bactrim DS. Taking this medication with food may help decrease gastrointestinal discomfort. Eating a bland diet and avoiding spicy or fatty foods may help relieve these effects. Those who experience vomiting should drink an ample amount of fluids each day to maintain adequate hydration. Severe vomiting should be brought to the attention of a physician for further instruction.

Vaginal Infection

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Women taking Bactrim DS 800-160 may develop a vaginal infection. Measures to prevent a vaginal infection include taking a daily probiotic supplement or eating foods that are high in natural probiotics, such as yogurt. The use of an antibiotic causes a decrease of healthy bacteria in the body, which creates an environment more susceptible to the overgrowth of yeast. Symptoms of a vaginal infection include:

• vaginal redness
  
• burning
  
• itching
  
• pain with intercourse,
  
• a thick
  
• white discharge

These symptoms should be brought to the attention of a gynecologist. A vaginal infection can be easily diagnosed by an internal examination and treated with a vaginal suppository cream.

Increased Sensitivity to Sunlight

Patients taking Bactrim DS may experience an increased sensitivity to sunlight and may develop sunburn easily. Patients should refrain from spending time in direct sunlight, tanning beds and sunlamps until they know how this medication will affect them. The use of protective clothing and sunblock is important for the prevention of sunburn.

Insomnia

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Bactrim DS 800-160 patients who experience insomnia should consult a physician. They may consider prescribing a sleep aid for the treatment of insomnia while being treated with Bactrim.