What Does The 'DS' Stand For In Bactrim DS?

In our latest question and answer, the pharmacist discusses what the 'DS' stands for in Bactrim DS.

Apr 04, 2018

Bernard asked

What does the 'DS' stand for in Bactrim DS?

Answer

The 'DS' is Bactrim DS stands for 'Double Strength'. This is to separate it from Bactrim, another commercially available drug, that contains the same active ingredients but is half the strength of Bactrim DS.

Bactrim is a combination of the following two drugs:

  • Sulfamethoxazole 400mg
  • Trimethoprim 80mg

Bactrim DS is a combination of the following two drugs:

  • Sulfamethoxazole 800mg
  • Trimethoprim 160mg

As you can see above, the milligrams content of sulfamethoxazole and trimethoprim in Bactrim DS is twice, or double, the amount that is contained in Bactrim.

The active ingredients in Bactrim as commonly referred to as TMP-SMX, TMP-SMZ, or SMX-TMP.

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