Interaction between Guanadrel and Methylphenidate
Moderate
Antagonism
| ID | DDInter845 and DDInter1189 |
| Interaction | Central nervous system (CNS) stimulants, particularly the amphetamines, may decrease the hypotensive effect of postganglionic adrenergic blocking agents such as guanadrel, guanethidine and rauwolfia alkaloids, which work by depleting catecholamine stores from adrenergic nerve endings. CNS stimulants can have peripheral sympathetic activity, thus they may elevate blood pressure on their own as well as antagonize some of the antiadrenergic effect produced by these hypotensive agents. |
| Management | Alternatives to postganglionic adrenergic blocking agents should be considered in hypertensive patients treated with CNS stimulants. If the combination is used, blood pressure and heart rate should be monitored. |
| References | |
| Alternative for Guanadrel | - |
| Alternative for Methylphenidate |
N06B
|
Potential Metabolism Interactions
Substrate-Substrate Interaction：If more than one drug is metabolized by the same CYP, it is possible that its metabolism is inhibited because of the competition between the drugs. That means, it can be useful to lower the dosage of the drugs in the drug-cocktail because they remain longer in the organism than in monotherapy.
Inhibitor-Inhibitor Interaction：Combining two or more inhibitors of one CYP, should be compensated by lowering the dosage of these drugs because the metabolism is reduced and the drugs remain longer in the organism than in monotherapy. Not adapting the dosage bears the risk of even more side effects.
Inhibitor-Substrate Interaction：Combining drugs that have inhibitory effect and are substrates of one particular CYP, should be compensated by lowering the dosage. They rest longer in the organism than in monotherapy. Not adapting the dosage bears the risk of even more side effects.