Medical resources supply general context. Provider-owned pages establish advertised products and terms, which may change. Each guide and profile lists its own references as well. A resource being cited does not imply endorsement of this notebook, CoreAge Rx or any other listed service.
Source notes
Checked October 6, 2026. Provider pages establish advertised terms; medical resources provide general context and do not endorse this publication.
- MedlinePlus: SildenafilPatient medication information
- NIDDK: Diagnosis of erectile dysfunctionFederal patient information
- NIDDK: Treatment for erectile dysfunctionFederal patient information
- FDA: Compounding questions and answersRegulatory explanation
- FDA: Generic Drug FactsFederal drug approval information
- CoreAge Rx: 4Play product informationSponsored provider; advertised formulation
- CoreAge Rx: 4Play offer and refill termsSponsored provider; advertised terms
- Hims: ED treatment optionsProvider-owned product and price page
- Ro: Erectile dysfunction treatmentProvider-owned product page
- BlueChew: Plans and GOLD formulationProvider-owned product page
- ZipHealth: Sildenafil pack prices and purchase optionsProvider-owned offer or policy
- ZipHealth: ED service and consultation offerProvider-owned offer or policy
- ZipHealth: General homepage and consultation statementProvider-owned offer or policy
- ZipHealth: Delivery fees and fulfillment conditionsProvider-owned offer or policy
- RedBox Rx: Sildenafil offerProvider-owned offer or policy
- RedBox Rx: ED menu and consultation offerProvider-owned offer or policy
- RocketRx: Treatment catalogProvider-owned product page
- RocketRx: Insurance, consultation and checkout chargesProvider-owned billing policy
- Rex MD: ED medication menuProvider-owned product and offer page
- Rex MD: Service, pharmacy and payment informationProvider-owned service page
- Pfizer: Viagra prescribing and patient informationManufacturer labeling; accessed October 6, 2026
- PlushCare: ED visits, medicines and membershipProvider-owned service and fee page
- Call-On-Doc: ED serviceProvider-owned service overview; no complete quote established
- NCCIH: Erectile dysfunction and sexual enhancementFederal evidence and safety overview
- FDA: How to buy medicines safely from an online pharmacyFederal pharmacy-verification guidance
Read the publishing notes for evidence limits and the sponsored relationship.