Sint Janskruid moet je niet gebruiken in combinatie, is ook te vinden in de bijsluiter. Wat niet te vinden is in de NL bijsluiter, maar wel in die van onder andere Canada:
The following medications may affect how combination hormonal contraceptives works or increase the risk of side effects:
antacids
ampicillin
analgesics
antihistamines
antimigraine preparations
barbiturates
benzodiazepines
carbamazepine
chloral hydrate
chloramphenicol
cotrimoxazole
ethosuximide
glutethimide
griseofulvin
meprobamate
metronidazole
neomycin
nitrofurantoin
penicillin
phenobarbital
phenylbutazone
phenytoin
primidone
rifampicin
sulfonamides
tetracyclines
troleandomycin
vitamin E
The following medications may be affected by combination hormonal contraceptives, change the way they work, or increase the risk of side effects:
acetaminophen
alcohol
aminocaproic acid
anticoagulants (e.g., warfarin)
anticonvulsants (e.g., valproic acid, carbamazepine)
antipyridine
ASA
beta blockers (e.g., propranolol, metoprolol, atenolol)
caffeine
chlordiazepoxide
clofibrate
clomipramine (and possibly other tricyclic antidepressants)
clonidine
cyclosporine
diazepam
folic acid
guanitidine
insulin
isoproterenol
lorazepam
meperidine
methyldopa
oral hypoglycemics (e.g., glyburide, gliclazide, glipizide)
oxazepam
phenothiazines (e.g., perphenazine, prochlorperazine, thrioridazine)
prednisone
reserpine
theophilline
vitamin B12
troel (de ~ (v.), ~en)
1 [inf.] vrouw of meisje
2 trut