[p=20, null, left]There are very limited preclinical and human data available concerning acute exposure to CS gas in pregnancy, and no available data for CR gas, CN gas, or pepper sprays. Available data on CS gas used for crowd control do not indicate an association with adverse effects on the fetus but are too limited to exclude an increased risk. Significant systemic toxicity is generally not expected following exposure to crowd control agents (other than expected lacrimatory effects), but patients with pre-existing medical conditions such as asthma or cardiovascular disorders may be at risk of systemic effects. If treatment is required, pregnant women should be treated as for the non-pregnant patient.[p=20, null, left]Exposure to crowd control agents at any stage of pregnancy would not usually be regarded as medical grounds for termination of pregnancy. However, other risk factors may be present in individual cases which may independently increase the risk of adverse pregnancy outcome. Clinicians are reminded of the importance of consideration of such factors when performing case specific risk assessments. Where exposure to crowd control agents has occurred even in the absence of maternal toxicity, enhanced fetal monitoring may be warranted, particularly in cases associated with maternal hypoxia or signs of systemic toxicity. Discussion with UKTIS is recommended in all cases of exposure.