diff --git a/stackdriver_exporter.go b/stackdriver_exporter.go
index 8726fc3..33cd2e0 100644
--- a/stackdriver_exporter.go
+++ b/stackdriver_exporter.go
@@ -18,6 +18,7 @@ import (
 	stdlog "log"
 	"net/http"
 	"os"
+	"slices"
 	"strings"
 
 	"github.com/PuerkitoBio/rehttp"
@@ -311,7 +312,8 @@ func main() {
 		"projectsFilter", *projectsFilter,
 	)
 
-	metricsTypePrefixes := strings.Split(*monitoringMetricsTypePrefixes, ",")
+	inputPrefixes := strings.Split(*monitoringMetricsTypePrefixes, ",")
+	metricsTypePrefixes := parseMetricTypePrefixes(inputPrefixes)
 	metricExtraFilters := parseMetricExtraFilters()
 
 	if *metricsPath == *stackdriverMetricsPath {
@@ -361,6 +363,30 @@ func main() {
 	}
 }
 
+func parseMetricTypePrefixes(inputPrefixes []string) []string {
+	metricTypePrefixes := []string{}
+
+	// Drop duplicate prefixes.
+	slices.Sort(inputPrefixes)
+	uniquePrefixes := slices.Compact(inputPrefixes)
+
+	// Drop prefixes that start with another existing prefix to avoid error:
+	// "collected metric xxx was collected before with the same name and label values".
+	for i, prefix := range uniquePrefixes {
+		if i != 0 {
+			previousIndex := len(metricTypePrefixes) - 1
+
+			// Drop current prefix if it starts with the previous one.
+			if strings.HasPrefix(prefix, metricTypePrefixes[previousIndex]) {
+				continue
+			}
+		}
+		metricTypePrefixes = append(metricTypePrefixes, prefix)
+	}
+
+	return metricTypePrefixes
+}
+
 func parseMetricExtraFilters() []collectors.MetricFilter {
 	var extraFilters []collectors.MetricFilter
 	for _, ef := range *monitoringMetricsExtraFilter {
diff --git a/stackdriver_exporter_test.go b/stackdriver_exporter_test.go
new file mode 100644
index 0000000..05d0e3e
--- /dev/null
+++ b/stackdriver_exporter_test.go
@@ -0,0 +1,37 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "testing"
+import "reflect"
+
+func TestParseMetricTypePrefixes(t *testing.T) {
+	inputPrefixes := []string{
+		"redis.googleapis.com/stats/memory/usage",
+		"loadbalancing.googleapis.com/https/request_count",
+		"loadbalancing.googleapis.com",
+		"redis.googleapis.com/stats/memory/usage_ratio",
+		"redis.googleapis.com/stats/memory/usage_ratio",
+	}
+	expectedOutputPrefixes := []string{
+		"loadbalancing.googleapis.com",
+		"redis.googleapis.com/stats/memory/usage",
+	}
+
+	outputPrefixes := parseMetricTypePrefixes(inputPrefixes)
+
+	if !reflect.DeepEqual(outputPrefixes, expectedOutputPrefixes) {
+		t.Errorf("Metric type prefix sanitization did not produce expected output. Expected:\n%s\nGot:\n%s", expectedOutputPrefixes, outputPrefixes)
+	}
+}