Details of Drug-Drug Interaction
| Drug General Information (ID: DDI5ODIKB6) | |||||||||
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| Drug Name | Sildenafil | Drug Info | Clonidine | Drug Info | |||||
| Drug Type | Small molecule | Small molecule | |||||||
| Therapeutic Class | Impotence Agents/Agents For Pulmonary Hypertension | Antihypertensive Agents | |||||||
| Structure | |||||||||
| Mechanism of Sildenafil-Clonidine Interaction (Severity Level: Moderate) | |||||||||
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| Additive hypotensive effects Click to Show/Hide Mechanism Graph | |||||||||
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| Drug Name | Sildenafil | Clonidine | |||||||
| Mechanism |
Hypotensive effects Prostacyclin receptor Agonist |
Antihypertensive agent Alpha-2 adrenergic receptor Agonist |
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| Key Mechanism Factor 1 | |||||||||
| Factor Name | Prostacyclin receptor |
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Structure
Sequence
MADSCRNLTYVRGSVGPATSTLMFVAGVVGNGLALGILSARRPARPSAFAVLVTGLAATDLLGTSFLSPAVFVAYARNSSLLGLARGGPALCDAFAFAMTFFGLASMLILFAMAVERCLALSHPYLYAQLDGPRCARLALPAIYAFCVLFCALPLLGLGQHQQYCPGSWCFLRMRWAQPGGAAFSLAYAGLVALLVAAIFLCNGSVTLSLCRMYRQQKRHQGSLGPRPRTGEDEVDHLILLALMTVVMAVCSLPLTIRCFTQAVAPDSSSEMGDLLAFRFYAFNPILDPWVFILFRKAVFQRLKLWVCCLCLGPAHGDSQTPLSQLASGRRDPRAPSAPVGKEGSCVPLSAWGEGQVEPLPPTQQSSGSAVGTSSKAEASVACSLC
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| Gene Name | PTGIR | ||||||||
| Uniprot ID | PI2R_HUMAN | ||||||||
| KEGG Pathway | hsa:5739 | ||||||||
| Protein Family | G-protein coupled receptor 1 family | ||||||||
| Protein Function |
Receptor for prostacyclin (prostaglandin I2 or PGI2). The activity of this receptor is mediated by G(s) proteins which activate adenylate cyclase.
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| Key Mechanism Factor 2 | |||||||||
| Factor Name | Adrenergic receptor alpha-2 | Structure Sequence | |||||||
| Protein Family | G-protein coupled receptor 1 family | ||||||||
| Protein Function |
Alpha-2 adrenergic receptors mediate the catecholamine-induced inhibition of adenylate cyclase through the action of G proteins. The rank order of potency for agonists of this receptor is oxymetazoline > clonidine > epinephrine > norepinephrine > phenylephrine > dopamine > p-synephrine > p-tyramine > serotonin = p-octopamine. For antagonists, the rank order is yohimbine > phentolamine = mianserine > chlorpromazine = spiperone = prazosin > propanolol > alprenolol = pindolol.
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| Mechanism Description |
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| Recommended Action | |||||||||
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| Management | Caution is advised if PDE5 inhibitors are prescribed in combination with antihypertensive agents. Patients receiving the combination should be advised to avoid rising abruptly from a sitting or recumbent position, especially following treatment initiation or a dosage increase, and to contact their doctor if they experience symptoms of hypotension such as dizziness, lightheadedness, fainting, or tachycardia. | ||||||||