Then, anti-TB drug susceptibility testing of MDR-TB isolates particularly for SLDs, namely p-aminosalicylic acid
(0.5 [micro]g/ml), ciprofloxacin (20 [micro]g/ml), amikacin (20 [micro]g/ml), d-cycloserine (30 [micro]g/ml), kanamycin (20 [micro]g/ml), and ethionamide (20 [micro]g/ml), was carried out on solid Lowenstein-Jensen medium using the 1% proportion sensitivity method as per the WHO guidelines.
Table 1: Substances that can cause Methemoglobinemia (4) Inorganic Agents Nitrates, fertilizers, chlorates, copper sulfates --fungicides Organic Agents Amyl Nitrate, Isobutyl Nitrite, Sodium Nitrite, Nitroglycerin, Nitroprusside, Nitric Oxide, Nitrogen Dioxide, Trinitrotoluene, Combustion products Drugs Local Anesthetics: Benzocaine, Lidocaine, Prilocaine Pyridium, Anti-malarials --Primaquine, Chloroquine, Rasburicase, Cyclophosphamide, Ifosfamide, flutamide, Acetaminophen, Acetanilid, Phenacetic, celecoxib, Zopiclone, Methlene Blue (high doses in G6PD-Deficient patients) Antibiotics: Sulfonamides, Nitrofurantoins, P-aminosalicylic acid
, Dapsone Industrial/Household Agents Aniline Dyes, Nitrobenzene, naphthalene (moth balls), aminophenol, nitroethane (nail polish remover)
Most dipstick pads that test for urobilinogen use p-dimethylaminobenzaldehyde and are susceptible to false-positive results from such compounds as p-aminosalicylic acid
, antipyrine, apronalide, chlorpromazine, phenazopyridine, phenothiazine, sulfadiazine, and sulfonamide.[3,4] One manufacturer included p-methoxybenzene-diazonium-fluoroborate as a reagent on its dipstick, producing a more specific test. False-negative results may yet occur when large quantities of nitrite are present.