Gay and bisexual men (GBM) engaging in chemsex can face various health and well-being-related challenges, the extent of which remains unknown given the limited research in the context of the COVID-19 pandemic. This paper examines the pandemic impacts on the health needs of GBM who engaged in chemsex and their experiences with related services. We applied interpretive description to produce knowledge with direct implications for improving practices and policies. Data were collected between July 2020 and January 2021 using in-depth semi-structured interviews with eight key informants who held chemsex expertise and 13 GBM with chemsex lived experiences. Interviews were transcribed, anonymized, and analyzed thematically, yielding three interrelated themes. First, participants argued that the COVID-19 public health response was heteronormative and moralizing, reinforcing feelings of shame among GBM who engaged in chemsex and further isolating them. This added a layer of stigma and exposed them to increased drug-related risks by obstructing harm reduction practices. Second, participants contended how the pandemic worsened the scarcity and shortcomings of chemsex-specialized services. The mandatory shift to online services made it harder to form meaningful therapeutic relationships, especially given the unique sensitivity and stigma associated with chemsex, further heightened during the pandemic. Third, this online shift simultaneously facilitated access to personalized and culturally sensitive care, especially for those with less urgent needs. Our findings’ implications emphasize the importance of adopting a comprehensive approach in chemsex care, integrating both in-person and online methods, to counteract health iniquities reinforced by the pandemic and the institutional responses to it.