Sulfite sensitivity is seen more frequently in asthmatic than in nonasthmatic people. In vitro studies have shown that bacterial amount of resistance develops more slowly with this mixture than with either sulfamethoxazole or trimethoprim exclusively. Bactrim and diabetes If you have problems with diabetes and you are taking Bactrim you should check your blood sugar regularly because the product may influence your blood sugar, contact your physician if the email address details are low sugar. Bactrim and pregnancy You should not take Bactrim if you are pregnant because this could be damaging for the developing fetus, it can also damage a nursing baby because the sulfamethoxazole or trimethoprim can forward into breasts milk. These cases are quite rare, but should be taken seriously. Notify your physician as soon as possible if you get started to notice these conditions.