Details of Drug Interaction

Details of Drug-Drug Interaction

 Drug General Information (ID: DDI2L1GATR)
  Drug Name Phenylephrine (nasal) Drug Info Guanethidine Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Mydriatics/Decongestants Antihypertensive Agents
  Structure

 Mechanism of Phenylephrine (nasal)-Guanethidine Interaction (Severity Level: Moderate)
     Antagonize the effect of antihypertensive agents Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Phenylephrine (nasal) Guanethidine
      Mechanism Hypertensive effects
sympathomimetic amine  		Antihypertensive agent
Noradrenaline transporter  Inducer
      Key Mechanism Factor 1
Factor Name Norepinephrine transporter
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Structure Sequence
MLLARMNPQVQPENNGADTGPEQPLRARKTAELLVVKERNGVQCLLAPRDGDAQPRETWGKKIDFLLSVVGFAVDLANVWRFPYLCYKNGGGAFLIPYTLFLIIAGMPLFYMELALGQYNREGAATVWKICPFFKGVGYAVILIALYVGFYYNVIIAWSLYYLFSSFTLNLPWTDCGHTWNSPNCTDPKLLNGSVLGNHTKYSKYKFTPAAEFYERGVLHLHESSGIHDIGLPQWQLLLCLMVVVIVLYFSLWKGVKTSGKVVWITATLPYFVLFVLLVHGVTLPGASNGINAYLHIDFYRLKEATVWIDAATQIFFSLGAGFGVLIAFASYNKFDNNCYRDALLTSSINCITSFVSGFAIFSILGYMAHEHKVNIEDVATEGAGLVFILYPEAISTLSGSTFWAVVFFVMLLALGLDSSMGGMEAVITGLADDFQVLKRHRKLFTFGVTFSTFLLALFCITKGGIYVLTLLDTFAAGTSILFAVLMEAIGVSWFYGVDRFSNDIQQMMGFRPGLYWRLCWKFVSPAFLLFVVVVSIINFKPLTYDDYIFPPWANWVGWGIALSSMVLVPIYVIYKFLSTQGSLWERLAYGITPENEHHLVAQRDIRQFQLQHWLAI
Gene Name SLC6A2
Uniprot ID SC6A2_HUMAN
KEGG Pathway hsa:6530
Protein Family Sodium:neurotransmitter symporter (SNF) (TC 2.A.22) family
Protein Function
Amine transporter. Terminates the action of noradrenaline by its high affinity sodium-dependent reuptake into presynaptic terminals.
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      Mechanism Description
  • Antagonize the effect of Phenylephrine (nasal) when combined with Guanethidine 

Recommended Action
      Management Due to their pressor effect, sympathomimetic amines should be used cautiously in patients with hypertension. alternatives to postganglionic adrenergic blocking agents should be considered if patients are treated with sympathomimetic amines, since effects of the latter may be intensified or diminished depending on whether they are direct- or indirect-acting. Most agents with indirect sympathomimetic activity are mixed-acting, thus it may be difficult to predict how they will be affected by postganglionic adrenergic blocking agents. If the combination is used, blood pressure and heart rate should be monitored.

References
1 Gulati OD, Dave BT, Gokhale SD, Shah KM "Antagonism of adrenergic neuron blockade in hypertensive subjects." Clin Pharmacol Ther 7 (1966): 510-4. [PMID: 5939974]
2 Ziegler CH, Lovette JB "Operative complications after therapy with reserpine and reserpine compounds." JAMA 176 (1961): 114-7
3 Spiers AS, Calne DB "Action of dopamine on the human iris." Br Med J 4 (1969): 333-5