‘Chemical cocktail’ of pharmaceuticals found in Djibouti coastal waters – Image for illustrative purposes only (Image credits: Pixabay)
Djibouti – Researchers have identified a mix of common medications in the coastal waters of the Gulf of Tadjourah, an area known for its coral reefs, mangroves, and fish nurseries. The findings come from sampling sites near Djibouti City, which houses more than 70 percent of the country’s population. Untreated urban wastewater appears to be the main pathway carrying these substances into the marine environment.
Compounds Detected in the Study
The team recorded several widely used pharmaceuticals at multiple locations. These included the anti-inflammatory drug ibuprofen, caffeine, and the antiepileptic medication carbamazepine. They also found levofloxacin, an antibiotic employed against tuberculosis, along with twelve additional pharmaceutical and personal care compounds. Concentrations varied by site. One location that receives both urban and hospital wastewater showed particularly elevated levels of ibuprofen. The presence of these substances together creates what the researchers describe as a chemical cocktail entering the coastal ecosystem.
Ecological Risks Identified
Lead author Abdillahi Elmi Adaneh noted that ibuprofen and caffeine stood out for their contribution to ecological risk. “One particularly surprising finding was the relatively high ecological risk associated with some common everyday pharmaceuticals, especially ibuprofen and caffeine,” he said. These everyday substances are often viewed as ordinary, yet they ranked among the main drivers of concern in the sampled waters. At the most affected site, ibuprofen levels reached hundreds of times the concentrations considered safe for aquatic life. The drug can interfere with reproduction, growth, enzymatic activity, and other physiological processes in marine organisms. Invertebrates, fish, and algae appear especially vulnerable to these disruptions.
Wastewater as the Primary Pathway
The study points to untreated urban wastewater as the dominant source of the contamination. Djibouti City’s dense population and limited treatment infrastructure allow these compounds to reach the gulf without processing. Hospital discharges at certain points add further pharmaceutical load to the same coastal zone. This combination of domestic and medical waste creates a steady input of active ingredients that persist in the marine environment. The gulf’s role as a biodiversity hotspot makes the ongoing exposure a matter of particular interest for conservation efforts.
Key points from the findings
- Multiple common medications detected in Gulf of Tadjourah waters
- Ibuprofen and caffeine linked to elevated ecological risk
- Untreated wastewater identified as main contamination route
- Marine organisms face potential disruption to growth and reproduction
The results underscore how routine pharmaceutical use can translate into measurable pressure on coastal ecosystems when wastewater management remains limited. Further monitoring will help clarify the full extent of exposure and any longer-term effects on the gulf’s marine communities.
