A 55-year-old gold miner with a lung disease called pneumoconiosis and a history of steroid use developed a rare and serious infection called disseminated nocardiosis, which spread to his brain. Standard treatment with high-dose antibiotics caused severe gastrointestinal toxicity, forcing doctors to adjust his medication.
Instead of stopping treatment, the team reduced the dose of trimethoprim-sulfamethoxazole (TMP-SMX) from 15 mg/kg/day to 11.25 mg/kg/day, then to a maintenance dose of 7.5 mg/kg/day. They also added imipenem and amikacin. By day 120, the patient showed clinical improvement, though a durable cure remains unconfirmed.
This is just one patient's story, so it's hard to draw broad conclusions. The approach falls below current treatment recommendations and requires careful drug monitoring. Still, it suggests that in extreme cases where standard doses cause severe side effects, a temporary dose reduction with close monitoring might be a bridge to full therapy.